U.S. Route 101 in California

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U.S. Route 101

US 101 highlighted in red
Route information
Maintained by Caltrans
Length808.111 mi[1] (1,300.529 km)
Portions of US 101 have been relinquished to or are otherwise maintained by local or other governments, and are not included in the length.
ExistedNovember 11, 1926 (1926-11-11)[2][3]–present
RestrictionsSTAA trucks are prohibited through Richardson Grove State Park[6][7]
Major junctions
South end I-5 / I-10 / SR 60 in Los Angeles
Major intersections
North end US 101 at Oregon state line near Brookings, OR
CountryUnited States
CountiesLos Angeles, Ventura, Santa Barbara, San Luis Obispo, Monterey, San Benito, Santa Clara, San Mateo, San Francisco, Marin, Sonoma, Mendocino, Humboldt, Del Norte
Highway system
SR 99 SR 103

U.S. Route 101 (US 101) is a major north–south United States Numbered Highway, stretching from Los Angeles, California, to Tumwater, Washington. The California portion of US 101 is one of the last remaining and longest U.S. Routes still active in the state, and the longest highway of any kind in California.[8] US 101 was also one of the original national routes established in 1926. Significant portions of US 101 between the Los Angeles area and the San Francisco Bay Area follow El Camino Real, the commemorative route connecting the former Alta California's 21 missions.

Although the highway has been superseded in overall importance for transportation through the state by Interstate 5 (I-5), US 101 continues to be the major coastal north–south route that links the Greater Los Angeles Area, the Central Coast, the San Francisco Bay Area, and the North Coast (Redwood Empire). Generally referred to as "101" by residents of Northern California, in Southern California it is often called "The 101" (pronounced "the one oh one").[9] The highway has portions designated as the Santa Ana Freeway, the Hollywood Freeway, the Ventura Freeway, South Valley Freeway, and Bayshore Freeway, as well as El Camino Real in many non-freeway segments. The Redwood Highway, the 350-mile-long (560 km) northernmost segment of the highway, begins at the Golden Gate and passes through the world's tallest and only extensive preserves of virgin, old-growth coast redwood trees.

Route description

US 101 northbound as it enters downtown Los Angeles
View northward from the Cahuenga Pass, 1972
US 101 northbound approaching Gaviota Tunnel through the Santa Ynez Mountains
Downhill (southbound) view of Cuesta Grade north of San Luis Obispo
The Golden Gate Bridge, which carries US 101 and SR 1 between San Francisco and Marin County
US 101 follows the Russian River past Frog Woman Rock in southern Mendocino County
The US 101/US 199 interchange

US 101 is part of the California Freeway and Expressway System,[10] and is part of the National Highway System,[11] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[12]

Portions of US 101 are eligible to be included in the State Scenic Highway System.[13] It is officially designated as a scenic highway by the California Department of Transportation (Caltrans) from Goleta to Las Cruces in Santa Barbara County,[4] and through Del Norte Coast Redwoods State Park in Del Norte County.[5] This designation means that there are substantial sections of highway passing through a "memorable landscape" with no "visual intrusions", where the potential designation has gained popular favor with the community.[14]

Los Angeles to Ventura

The south terminus of US 101 is in Los Angeles, about one mile (1.6 km) east of downtown Los Angeles at the East Los Angeles Interchange, also known as the "Commuters' Complex". This southernmost portion is named the Santa Ana Freeway, inheriting that title as the northerly extension of the roadway now known as I-5. US 101 heads north for 2 miles (3.2 km) before merging with the western end of the San Bernardino Freeway (I-10).

After merging with westbound traffic from the San Bernardino Freeway (I-10), US 101 then proceeds northwest via the Downtown Slot under the northern edge of Los Angeles' Civic Center to State Route 110 (SR 110) at the Four Level Interchange. From here, US 101 becomes the Hollywood Freeway. It then passes through the L.A. neighborhoods of Echo Park, Silver Lake, and Los Feliz and heads to Hollywood and up through the Cahuenga Pass before reaching the San Fernando Valley.

US 101 passes right next to the Universal Studios Hollywood and then intersects with SR 134 and SR 170 at the interchange known as the Hollywood Split. Here, the alignment of US 101 shifts to the alignment of SR 134 (i.e. heading northbound, the road's alignment turns left, or westbound) and thereafter is referred to as the Ventura Freeway until it reaches Ventura. Though confusing, the "Hollywood Freeway" name continues northward from this interchange on SR 170, and the "Ventura Freeway" name continues eastward to SR 134.

From the Hollywood Split, US 101 is an east–west highway (until it reaches Gaviota State Park in Santa Barbara County where it shifts back to a north–south alignment). It meets with I-405 in Sherman Oaks, an interchange which holds claim to the most traveled intersection in the nation. The east–west geographical alignment of the Ventura Freeway and the north–south designation which appears on the freeway signs can be confusing to visitors; the same freeway entrance can often be signed as "101 North" and "101 West"; this is most common in the San Fernando Valley where the local E/W signing does not match the Caltrans' proper statewide N/S designation.

After the Conejo Grade, which is a 7% grade incline, the freeway enters the Oxnard Plain and runs concurrent with SR 1 for the first time. Upon reaching Ventura, there is an interchange with SR 126, which runs east to Santa Clarita.

Central Coast

North of Santa Barbara, US 101 switches intermittently between freeway and expressway status (i.e. there is occasional cross-traffic), but there are no traffic signals until San Francisco. The last traffic signals along this stretch of the route were removed in 1991 when the section through downtown Santa Barbara was constructed to freeway standards after years of disagreement over the impact that the original elevated design would have on the community.[15]

From Ventura and through Santa Barbara, US 101 closely follows the Gaviota Coast (generally no more than one to two miles [1.6 to 3.2 km] from the shore) until Gaviota State Park, about 23 miles (37 km) west of Goleta. At Gaviota State Park, the highway shifts back from an east–west highway to a north–south alignment. About one mile (1.6 km) north of this point, the northbound lanes pass through the Gaviota Tunnel.

A few miles north of the Gaviota Tunnel, SR 1 splits from US 101 and heads northwest, running along the Pacific coastline parallel and to the west of US 101. US 101 passes through Buellton, Los Alamos, Orcutt, Santa Maria, and Nipomo. South of Santa Maria, US 101 widens from a four-lane highway to a six-lane freeway. SR 166 joins US 101 for about 3 miles (4.8 km) before splitting just north of the city limits, while US 101 continues as a four-lane freeway before reverting to expressway status north of Nipomo.

Farther north, SR 1 rejoins US 101 between Pismo Beach and San Luis Obispo. Then US 101 takes an inland route through the Salinas Valley, while Highway 1 heads northwest, running along the Pacific coastline in California, parallel and to the west of US 101.

A steep segment (7% grade) between San Luis Obispo and Atascadero is known as the Cuesta Grade. North of Atascadero, the highway joins SR 46 for about three miles (4.8 km) through Paso Robles.

From Paso Robles to Salinas, US 101 is an expressway known as the Salinas River Valley Highway, since the Salinas River Valley extends from Santa Margarita to the SR 156 junction in Prunedale. US 101 resumes freeway status between San Miguel and King City, bypassing the smaller towns of Camp Roberts, Bradley, and San Ardo, as well as the San Ardo Oil Field about five miles (8.0 km) south of San Ardo. Near this point, the wide agricultural bottomlands of the Salinas Valley begins. North of King City, US 101 once again switches intermittently between freeway and expressway status, passing through Greenfield, Soledad, Gonzales, and Chualar before reaching Salinas. Shortly after leaving Salinas, US 101 joins SR 156 in Prunedale for about eight miles (13 km). After crossing the San Benito County line, SR 156 splits from US 101 near San Juan Bautista while US 101 continues northward mostly as a four-lane highway until it reaches Gilroy.

San Francisco Bay Area

US 101 crosses the Pajaro River into Santa Clara County as a four-lane highway, with an interchange at SR 25 a few miles later. Upon reaching Gilroy, it becomes the South Valley Freeway (as in South Santa Clara Valley), and at the same time, it expands to three lanes in each direction. It then enters Silicon Valley when reaching Morgan Hill, and shortly afterwards expands to four lanes in each direction, with an HOV lane in the middle, before reaching San Jose. From San Jose to San Francisco, US 101 is known as the Bayshore Freeway as it passes through Palo Alto and the other major communities along the San Francisco Peninsula.

US 101 is called the James Lick Freeway, named for James Lick, a philanthropist, from the San Francisco county/city line, through the interchange with I-280 at the Alemany Maze, until the junction with the San Francisco Skyway (I-80) and the Central Freeway near the city's Civic Center. US 101 continues in a northwestern direction on the Central Freeway, and then leaves the freeway, on Mission Street (northbound) and South Van Ness Avenue (southbound), to run north on Van Ness Avenue. At the intersection of Van Ness Avenue and Lombard Street, US 101 heads west on Lombard Street, and then on Richardson Avenue, entering The Presidio, where it becomes a divided highway again (the Presidio Parkway). It is then joined by Route 1 before approaching and crossing the Golden Gate Bridge.

From San Francisco north the highway is heavily traveled by commuters through to Windsor, just north of Santa Rosa. North of the Golden Gate Bridge, US 101 enters Marin County and is known as the Redwood Highway. After crossing the bridge, US 101 climbs the Waldo Grade and passes through the Robin Williams Tunnel, the only one of its kind in 300 miles (480 km) (the other being the Gaviota Tunnel in Santa Barbara County). Upon exiting the tunnel, it passes above the hillside town of Sausalito and descends to Richardson Bay, where SR 1 splits from the freeway and heads to the coast. US 101 then passes through Mill Valley, Corte Madera, Larkspur, San Rafael and Novato, before entering Sonoma County. The section between Novato in Marin County and Petaluma in Sonoma County changes from its original six or eight lanes through Marin to four lanes, creating a bottleneck, and is thus called the "Novato Narrows" by locals.[16] The Narrows continue up to the county line between Marin and Sonoma Counties. The entire area between Novato and Petaluma is also the voter approved Novato–Petaluma Community Separator, which forbids most development.[17]

Upon entering Sonoma County, the freeway widens again to six lanes from the county line to Windsor, passing through Petaluma, Cotati, Rohnert Park, and Santa Rosa. Upon reaching Windsor, the freeway returns to two lanes in each direction, crossing the Russian River in Healdsburg and then following the river up the Alexander Valley. SR 128 joins US 101 in the town of Geyserville before splitting just north of Cloverdale. US 101 then heads up a steep hill just before leaving Sonoma County and entering Mendocino County.

North Coast

US 101 crosses into Mendocino County as a freeway for one mile (1.6 km), but then narrows to an expressway through the Russian River canyon and eventually a two-lane road south of Hopland, the first time since leaving San Francisco. Just before reaching Ukiah, US 101 becomes a four-lane freeway. In the community of Calpella, SR 20 merges with US 101 for the next 15.5 miles (24.9 km) to Willits. The freeway portion ends as the combined US 101 and SR 20 ascend the 1,956-foot (596 m) Ridgewood Summit, the highest elevation along the route's 808-mile-long (1,300 km) trek through California.[18] As US 101 resumes freeway status just south of Willits, SR 20 splits from US 101 shortly before it suddenly reverts to a 2-lane undivided freeway and eventually a highway north of Willits.

US 101 then widens to a four-lane expressway until the intersection with the western portion of SR 162, where it reverts to a two-lane road. North of Laytonville, US 101 ascends Rattlesnake summit (1,796 feet or 547 meters) before a descent to follow the South Fork Eel River and Eel River all the way to Fortuna near the mouth of the river. About 12 miles (19 km) northwest of Laytonville, US 101 becomes an undivided freeway near the community of Cummings. SR 271 is the old portion of US 101 through this area. At Leggett, US 101 meets SR 1 for the last time, and from this point until Piercy, US 101 runs along a section of highway with frequent landslides. Caltrans bypassed the most difficult section in 2009 with unique construction of two bridges known collectively as the Confusion Hill Bridges. This project, funded by an emergency act from the State Legislature, moved the highway across the Eel River away from the troubled spots to prevent disruption in commerce and travel from infrequent, but costly, winter closures on the main transportation route to the far North Coast. North of Piercy, the freeway portion again ends and the road narrows down to two lanes, before another stretch of divided highway.

Arriving in Humboldt County, another narrow two-lane portion of US 101 bisects Richardson Grove State Park. Because of the narrow lanes and the redwood trees that tower over this segment of the highway, standard-sized trucks in compliance with the Surface Transportation Assistance Act (STAA) are prohibited through the park.[6][7] Just after the park boundary, the highway switches to a short undivided freeway and then eventually a divided freeway just before reaching Garberville. North of Garberville, US 101 reverts to an undivided freeway, which continuing north by northwest, passes through the 53,000-acre (210 km2) Humboldt Redwoods State Park, California's third largest State Park and the site of the largest remaining Redwood old growth forest in the world. A preserved portion of the original, bypassed highway route, known as the Avenue of the Giants for the huge, centuries-old redwood trees, parallels the highway for over 30 miles (48 km) in southern Humboldt County. US 101 again switches to another stretch of divided freeway near the town Pepperwood before reverting to a short, 2-mile (3 km) expressway just north of Stafford. A short freeway then runs through Rio Dell before another short, 3-mile (5 km) expressway.

Shortly before reaching the western terminus of SR 36, US 101 becomes a freeway again between Fortuna and Eureka. North of Humboldt Hill, the road enters the City of Eureka (a potential new freeway cutting through or bypass of the city was successfully blocked repeatedly). As the route traverses Eureka, the southern portion is known as "Broadway" and then as it bears east along Humboldt Bay, the Highway is aligned on a one-way couplet (4th and 5th streets). Five miles (8.0 km) later the highway leaves Eureka's northern city limit and continues north. The expressway style section between Eureka and Arcata, which is also a safety corridor, is named the "Michael J. Burns Freeway," in honor of the State Senator who was a proponent of California's Highways. The highway becomes an unobstructed freeway south of the center of Arcata. Proceeding north it passes the junction for SR 299 (also the western terminus for that route), in the Valley West (northernmost) part of the college town.

The highway continues north as it skirts westerly around McKinleyville on a high bluff north of the Mad River. As the highway reaches Clam Beach (a county park), motorists get their first magnificent full view of the Pacific Ocean north of the Golden Gate. North of Trinidad, the highway narrows to one lane in each direction after crossing Big Lagoon to pass inland of Stone Lagoon and follow the coastal bar between Freshwater Lagoon and the Pacific Ocean south of Orick. It becomes a 14-mile (23 km) undivided freeway through Redwood National and State Parks running inland east of the Prairie Creek Redwoods State Park boundary. The freeway narrows to one lane in each direction at the Klamath River before losing its freeway designation in Klamath. The original placement of the highway near giant Coast Redwoods led to increased awareness of the destruction of the redwoods after decades of extensive logging, which ultimately led to the establishment of Redwood National Park in 1968. The original highway segment through Prairie Creek Redwoods State Park is now a scenic alternate similar to Avenue of the Giants, named Newton B. Drury Scenic Parkway in honor of the fourth director of the National Park Service and executive director of the Save-the-Redwoods League

North of the town of Klamath just inside Del Norte County, the highway closely follows the Pacific coast again. In Crescent City, US 101 once again separates into a one-way couplet (L and M Streets) for nine blocks. As it leaves Crescent City, US 101 becomes a divided freeway for the last time in California (built slightly to the west of the original two-lane alignment, now called Parkway Drive). As the 3-mile divided freeway portion ends, US 101 intersects the southern terminus of US 199, which heads northeast as the Redwood Highway, passing through the Collier Tunnel and terminating in Grants Pass, Oregon. US 101 (no longer called the "Redwood Highway" at this point) is reduced to two lanes and continues north along the California coast until it reaches the Oregon border.


Express lanes

High-occupancy toll (HOT) lanes along US 101 between SR 237 in Mountain View and Whipple Avenue in Redwood City opened on February 11, 2022.[19][20] These express lanes were extended to I-380 in San Bruno on March 3, 2023,[21] and are planned to be extended further south to I-880 in San Jose in Fall 2026.[22]

As of August 2022, the HOT lanes' hours of operation is weekdays between 5:00 am and 8:00 pm. Solo drivers are tolled using a congestion pricing system based on the real-time levels of traffic. Two-person carpools and clean air vehicles with a solo driver are charged 50 percent of the posted toll. Carpools with three or more people and motorcycles are not charged.[23][24] All tolls are collected using an open road tolling system, and therefore there are no toll booths to receive cash. Each vehicle using the HOT lanes is required to carry either a FasTrak Flex or CAV (Clean Air Vehicle) transponder, with its switch set to indicate the number of the vehicle's occupants (1, 2, or 3 or more). Solo drivers may also use the FasTrak standard tag without the switch.[23][24] Drivers without any FasTrak tag will be assessed a toll violation regardless of whether they qualified for free.[25]

The segment of the express lanes in Santa Clara County is co-administered by the Santa Clara Valley Transportation Authority (VTA) while the segment in San Mateo County is co-administered by the separate San Mateo County Express Lanes Joint Powers Authority, and so drivers will see separate toll charges when using each segment.[23][24]

Golden Gate Bridge

Tolls are collected only for southbound traffic on the Golden Gate Bridge headed to San Francisco. An open road tolling system is also used on the bridge, and they can be paid by either a FasTrak transponder or license plate tolling. The high-occupancy vehicle (HOV) lane leading to the bridge requires a car with three or more people.[26]


Distinctive route markers with symbolic mission bell and shepherd's crook are seen along the segments of US 101 that follow the historic El Camino Real between Los Angeles and Marin Counties
Early narrow concrete pavement survives on some former alignments like this stage route near Mission San Miguel Arcángel was designated US 101 until bypassed in 1938
Ferryboat Eureka at Hyde Street Pier with US 101 sign
Historic US 101 roadside attraction in Ukiah, now bypassed by the freeway

Juan Bautista de Anza National Historic Trail

The US 101 Highway is part of the auto tour route of the Juan Bautista de Anza National Historic Trail, a National Park Service unit in the United States National Historic Trail and National Millennium Trail programs.[27] In 2005, Caltrans began posting signs on roads that overlap with the historic 1776 Juan Bautista de Anza trail route, so that California drivers can now follow the trail.

Historic route: San Diego to Los Angeles

Instead of terminating in Los Angeles, US 101 once continued all the way south through San Diego to the United States–Mexico border in San Ysidro. However, this part was decommissioned on July 1, 1964, in favor of I-5. Though much of U.S. Route 101 has been superseded by I-5, several street segments of former Route 101 exist.

Historic route in San Diego County

Much of the route in northern San Diego County is County Route S21; this includes Coast Highway in Oceanside, Carlsbad Boulevard in Carlsbad, Coast Highway 101 in Encinitas, Camino del Mar in Del Mar, and Torrey Pines Road in Torrey Pines. In San Diego, one alignment entered La Jolla Village on La Jolla Blvd, while a newer alignment went through Rose Canyon under what is now I-5. Roads followed by US-101 in San Diego included Mission Bay Drive, Pacific Hwy, Harbor Drive and Main Street. It ran along National City Blvd in National City, Broadway in Chula Vista and Beyer Blvd in San Ysidro.

Oceanside–Carlsbad freeway bypass

By the early 1950s, traffic had become very heavy on US 101 through Oceanside and Carlsbad. The US 101 freeway bypass (Oceanside-Carlsbad freeway bypass) was built in 1953 and completed in 1955 by the California Department of Public Works (now Caltrans) and brought up by the San Diego Highway Development Association on a US 80/US 101 discussion on how to resolve the huge traffic loads on US 101 in Oceanside. Today it is part of I-5 and Palomar Airport Road. It follows I-5 from Coast Highway (former Hill Street exit) in Oceanside to Palomar Airport Road in Carlsbad. From there the US 101 bypass went onto Palomar Airport Road to merge with US 101 Bus. on Carlsbad Boulevard. As it approached the Coast Highway/SR 76 exit on southbound I-5 in Oceanside, US 101 Bus. split off. US 101 Bus. followed the original US 101 through downtown Oceanside and Carlsbad as former Hill Street/Carlsbad Boulevard (CR S-21) while the US 101 freeway followed modern I-5 and Palomar Airport Road. The south end of the freeway bypass is Carlsbad Boulevard and Palomar Airport Road and the north end is I-5 and the Coast Highway/SR 76 exit. The south end was modified after US 101 was decommissioned between the East Los Angeles Interchange in Los Angeles and the Mexican border in San Ysidro. This freeway construction by the California Department of Public Works put US 101 on an all new highway route alignment to relieve Oceanside and Carlsbad of their very heavy bumper-to-bumper burdensome traffic problem. Also before the bypass in the 1950s, US 101 followed North Coast Highway (formerly Hill Street) from San Luis Rey Mission Expressway (SR 76 and north end of the Oceanside–Carlsbad freeway bypass) to Harbor Drive. From there it followed Harbor Drive to Vandergrift Boulevard, San Rafael Drive, and the freeway onramp for I-5 north near the Camp Pendleton north entrance guardhouse gate. It merges with the I-5 northbound onramp to shoot onto the southbound lanes of I-5 to follow the freeway lanes all the way to Las Pulgas Road in Camp Pendleton.

Historic route in Orange and Los Angeles Counties

An old orphaned alignment of US 101, that ran through the cities of Mission Viejo, Laguna Niguel, San Juan Capistrano, Dana Point, and San Clemente, was located in south Orange County. The old roadway, from a dead end just west of I-5 and east of the railroad tracks in Mission Viejo to Cristianitos Road in San Clemente, followed Camino Capistrano, Doheny Park Road, Coast Highway and El Camino Real. It had interchanges with I-5 and California State Route 1. It was replaced by the San Diego freeway (which US 101 became part of it in 1958) and finally replaced by I-5 in 1968.

In northern Orange County, US 101 followed Harbor Boulevard. U.S. Route 101 left Orange County, traversed southeast Los Angeles County, and entered the City of Los Angeles along Whittier Boulevard.

El Camino Real: Los Angeles to San Francisco

Significant portions of US 101 from its southern terminus to the San Francisco Bay Area is designated as the Royal Road or El Camino Real. The route roughly follows the historic trail that connected the former Alta California's 21 missions.

Before the Golden Gate Bridge was completed in 1937, there was regular vehicle ferry service across the Golden Gate strait, running from the Hyde Street Pier to Sausalito. Under the California Streets and Highways Code § 401, the Golden Gate Bridge is legally not part of US 101. The portion of US 101 starting from Los Angeles ends at "the approach to the Golden Gate Bridge" and then resumes at "a point in Marin County opposite San Francisco" to the Oregon state line. The bridge itself is maintained by the Golden Gate Bridge, Highway and Transportation District instead of Caltrans.

From the 1940s to 1991, various segments of US 101 between Los Angeles and San Francisco were upgraded to either a freeway or expressway. In the Los Angeles area, the first segment of the Hollywood Freeway through the Cahuenga Pass opened in 1940, while the segment from the San Fernando Valley to Downtown Los Angeles opened in 1954, replacing Cahuenga Boulevard.[28] The Ventura Freeway then opened in 1960, replacing Ventura Boulevard.[29] The segment of the original two-lane alignment between Emma Wood State Beach north to the Mobil Pier Undercrossing near Sea Cliff, which followed the historic Rincon Sea Level Road, was the re-signed as part of SR 1.

In the San Francisco Bay Area, US 101 was originally divided. US 101W followed the same general right-of-way of today's US 101 through the region, primarily along what was originally signed as Bayshore Boulevard. US 101E then generally followed the right-of-way taken by today's I-880 from San Jose to Oakland, then across the Carquinez Bridge to follow what is now SR 37, joining US 101W. The US 101E designation was removed by the 1940s and became SR 17 (later designated as I-880 and the westernmost section I-580), running from San Jose to Oakland and then across the Richmond–San Rafael Bridge. Meanwhile, Bayshore Boulevard was later redesignated as the US 101A bypass and then eventually upgraded to what is now the Bayshore Freeway. The first stretch that was completed between Redwood City and South San Francisco was the Bay Area's first freeway when it opened in 1947. After the entire Bayshore Freeway was completed in the early 1960s, the old alignment along the peninsula was renumbered and renamed as SR 82/El Camino Real.

Various other freeway or expressway bypasses along the California Central Coast were also built. In 1991, the last traffic signal along US 101 between Los Angeles and San Francisco was taken down in Santa Barbara.[30] The primary control city that is listed on freeway signs along northbound US 101 through the Central Coast region remains San Francisco.

As the result of freeway revolts in San Francisco in the 1950s, a direct freeway connection through the city to the Golden Gate Bridge has never been built. The Central Freeway was completed to extend from the Bayshore Freeway to Turk Street in 1959,[31][32] before the San Francisco Board of Supervisors voted to remove the remainder of the Central Freeway and most other proposed freeways from the city's highway plan.[33] For decades, southbound traffic on US 101 flowed on the one-way Turk Street from Van Ness Avenue to the Central Freeway, while northbound traffic used the parallel Golden Gate Avenue. After the 1989 Loma Prieta earthquake damaged the structure, the segment of the Central Freeway north of Market Street was replaced with the surface-level Octavia Boulevard; traffic on US 101 was then eventually re-routed to exit south of that at Mission Street/South Van Ness Avenue. With no direct freeway along US 101 through the City of San Francisco, the old US 101E/I-880/I-580 route remains as a faster bypass through the Bay Area.

In the wake of the dot-com bubble expansion, the segment of US 101 between Morgan Hill and San Jose, also known as the Sig Sanchez Freeway, expanded to eight lanes between Cochrane Road and SR 85 exits between 2001 and 2003 and a new interchange at Bailey Avenue, which had been planned since the 1970s, opened in 2004.[34] Originally, the ten-mile segment was only four lanes (it was planned to have six lanes when opened in 1984).[35] The improved segment was to alleviate the consistent congestion that had expanded as far south as Masten Avenue coming from Gilroy, and as far north as Bernal Road coming from San Jose.[36][37] Traffic now typically only runs slow between the Bailey Avenue and East Dunne Avenue exits.

The interchange at the beginning of I-280 and I-680 in San Jose was constructed years before its completion. The three flyovers, with no on ramps or off ramps connecting them stood at 110-foot-tall (34 m) over US 101 for years in the 1970s (the SR 87/I-280 interchange also had this at the same time). It became the butt of many local jokes. The highlight prank occurred in January 1976, when a 1960 Chevrolet Impala was placed on the highest bridge overnight, where it obviously would be impossible to drive. The following day, San Jose City Councilman Joe Colla was photographed standing next to the car, a photo which was circulated across many newspapers.[38] It has been suggested this stunt nudged the wheels of progress to find the funds to complete the freeway. In 2010, the interchange was named the Joe Colla Interchange.[39]

Redwood Highway: Marin County to Del Norte County

An abandoned segment of the Redwood Highway, US 101, located in the Redwood National and State Parks near Klamath was added to the National Register of Historic Places in 1979.[40]

Freeway segments along the Redwood Highway portion of US 101 are not as prevalent as along the Los Angeles-San Francisco route. A notable segment of the old US 101 alignment is SR 254, also known as the Avenue of the Giants, in Humboldt Redwoods State Park. The freeway bypassing this scenic route, surrounded by towering Coast Redwoods, was completed in 1960.[41] Several bridges along the segment of highway running along the Eel River were destroyed during the Christmas flood of 1964.

Construction on a freeway segment bypassing Willits began in 2013.[42] The bypass around Willits remained controversial because the intended route goes through protected wetlands. Construction was halted by US Army Corps of Engineers in June 2014 and work restarted the following month after Caltrans committed to extensive mitigation of the project.[43][44] The 5.9 mi (9.5 km) bypass around Willits opened to traffic in November 2016.[45] The bypass included a 1.1 mi (1.8 km) viaduct going over a flood plain.[46] The freeway segment cost $459 million to complete, 50% more than what Caltrans first reported when it opened.[47]

The city of Eureka has long resisted a freeway through it.[48]


The proposed Wallis Annenberg Wildlife Crossing is a vegetated overpass spanning the Ventura Freeway and Agoura Road at Liberty Canyon in Agoura Hills. If built, it will be one of the largest urban wildlife crossings in the United States, connecting the Simi Hills and the Santa Monica Mountains over a busy freeway with ten traffic lanes (including exit lanes).[49][50]

The Richardson Grove section of US 101 has been proposed for a bypass for many years, but Caltrans conducted a study in 2000 which stated that a bypass was not cost effective and recommended realignment of US 101 within the redwood grove instead to accommodate modern-sized trucks in compliance with the Surface Transportation Assistance Act (STAA).[6][7]

Major intersections

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers to an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see California postmile § Official postmile definitions).[1] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

Los Angeles
LA S0.00-38.19
Los Angeles
I-5 south (Santa Ana Freeway south) – Santa Ana
No access to I-5 north; southern terminus of US 101; southern end of East Los Angeles Interchange
Euclid AvenueSouthbound exit and northbound entrance

SR 60 east (Pomona Freeway) / Soto Street – Pomona
Southbound exit and northbound entrance; northern end of East Los Angeles Interchange proper; SR 60 west exit 1C
S0.001ASeventh StreetSouthbound exit and northbound entrance
Whittier BoulevardNorthbound entrance only
S0.621AFourth StreetNo northbound entrance; signed as exit 1B southbound
S0.911BFirst StreetNo southbound entrance; signed as exit 1C southbound
1CCesar Chavez AvenueNorthbound exit only; was formerly Brooklyn Avenue
I-10 east (San Bernardino Freeway) – San Bernardino
No southbound entrance, was demolished in 1996 due to seismic issues;[54] San Bernardino Split portion of the East Los Angeles Interchange; access to I-10 via the San Bernardino Freeway spur; left exit southbound; former western terminus of US 60 / US 70; former US 99 south; former I-110 east (1958–1965)
0.101EMission RoadNo northbound exit
0.622AVignes StreetNorthbound exit and entrance
2A-BAlameda Street – Union StationSigned as exit 2A southbound, 2B northbound
0.822BLos Angeles StreetNo northbound exit
1.102CSpring StreetNorthbound exit only
1.102CBroadwaySouthbound exit and northbound entrance
1.403ATemple StreetSouthbound exit and entrance

SR 110 to I-110 south (Harbor Freeway, Arroyo Seco Parkway) / Grand Avenue – Pasadena, San Pedro
Northern end of Santa Ana Freeway; southern end of Hollywood Freeway[55] Four Level Interchange; Grand Avenue not signed southbound; signed as exit 3B southbound; SR 110 exit 24A
2.484AGlendale Boulevard, Echo Park Avenue, Union AvenueUnion Avenue not signed northbound; Echo Park Avenue not signed southbound
SR 2 east (Alvarado Street)
Southern end of SR 2 overlap
3.345ARampart Boulevard, Benton Way
3.765BSilver Lake Boulevard
4.406AVermont Avenue
4.856BMelrose Avenue, Normandie Avenue
SR 2 west (Santa Monica Boulevard) / Western Avenue
Northern end of SR 2 overlap
6.258ASunset BoulevardNo northbound entrance
6.528BHollywood Boulevard
6.918CGower Street
7.069AVine StreetSouthbound exit only
7.469BCahuenga Boulevard – Hollywood BowlSigned as exit 9A northbound
7.849CHighland Avenue – Hollywood BowlFormer SR 170 south; signed as exit 9B northbound
8.84Cahuenga Pass, elevation 745 feet (227 m)[56]
9.2211ABarham Boulevard – BurbankNo southbound exit, which was permanently closed on October 17, 2015 due to weaving concerns with the construction of the new Universal Studios Boulevard southbound onramp.[57]
9.6011BUniversal Studios BoulevardNo southbound exit; serves Universal Studios Hollywood
10.3412ALankershim Boulevard – Universal CityServes Universal Studios Hollywood
10.5612BVentura BoulevardNo southbound exit

Vineland Avenue to SR 134 east – Pasadena
Signed as exit 12B southbound
Moorpark StreetNorthbound entrance only
SR 170 north (Hollywood Freeway north) – Sacramento
Northbound left exit and southbound left entrance; US 101 north transitions onto Ventura Freeway west;[55] southern end of Hollywood Split; SR 170 south exit 5A
SR 134 east (Ventura Freeway east) – Pasadena
Southbound exit and northbound entrance; US 101 south transitions onto Hollywood Freeway south;[55] northern end of Hollywood Split; SR 134 west exit 1A

Tujunga Avenue to SR 170 north
Southbound exit and northbound entrance
12.8514Laurel Canyon Boulevard – Studio City
13.8815Coldwater Canyon Avenue
14.8916Woodman Avenue
15.9117Van Nuys Boulevard
16.9418Sepulveda BoulevardNorthbound exit and southbound entrance
17.1719A I-405 (San Diego Freeway) – Santa Monica, SacramentoI-405 exit 63B
17.5019BHaskell AvenueNo southbound entrance
18.6120Hayvenhurst AvenueNorthbound exit and southbound entrance
19.2221Balboa Boulevard – Encino
20.2322White Oak Avenue
21.2523Reseda Boulevard
22.2524Tampa Avenue
23.2625Winnetka Avenue – Woodland Hills
24.3126ADe Soto Avenue, Serrania AvenueSigned as exit 26 southbound
24.8526BCanoga AvenueNorthbound exit and southbound entrance
25.3427 SR 27 (Topanga Canyon Boulevard) / Ventura BoulevardSigned as exits 27A (north) and 27B (south) northbound
25.7627CShoup AvenueNorthbound exit and southbound entrance
26.4528Fallbrook AvenueSouthbound exit only
26.8628Woodlake AvenueNorthbound exit and entrance
27.3629Mulholland Drive, Valley Circle Boulevard
Calabasas28.2930Parkway Calabasas
31.0632Las Virgenes Road (CR N1) – Malibu Canyon
31.9233Lost Hills Road
Agoura Hills32.7934Liberty Canyon Road
Wallis Annenberg Wildlife Crossing (planned to open in 2023[58])
33.6935Chesebro Road
35.0436Kanan Road (CR N9)
36.1838Reyes Adobe Road
Westlake Village37.5439Lindero Canyon Road
VEN 0.00-R43.62
Thousand Oaks0.7040
SR 23 south (Westlake Boulevard)
Southern end of SR 23 overlap
1.6241Hampshire Road
3.0243ARancho RoadSigned as exit 43B northbound
SR 23 north (Moorpark Freeway) – Fillmore, Simi Valley
Northern end of SR 23 overlap; signed as exit 43A northbound; SR 23 south exits 12A-B; Simi Valley only seen on northbound side
4.0644Moorpark Road
5.0545Lynn Road
6.1946Ventu Park Road – Newbury Park
7.0247ARancho Conejo Boulevard, Borchard RoadSigned as exits 47A (Rancho Conejo Boulevard) and 47B (Borchard Road) northbound
7.8947BWendy Drive – Newbury ParkSigned as exit 47C northbound
Camarillo10.7450Camarillo Springs Road – Camarillo Grove County Park
12.3052Santa Rosa Road, Pleasant Valley Road
13.7553AFlynn RoadNorthbound signage
Dawson DriveSouthbound signage
13.8553B SR 34 (Lewis Road)
14.8054Carmen Drive
15.8955Las Posas Road
16.7956Springville Drive
17.7557Central Avenue
Oxnard19.1759Del Norte Boulevard
20.0860Santa Clara Avenue, Rice AvenueFuture SR 1 south[59]
21.0161Rose Avenue
22.0162A SR 232 (Vineyard Avenue) – Oxnard
SR 1 south (Oxnard Boulevard)
Southern end of SR 1 overlap
63AVentura RoadSouthbound exit only
VenturaR23.4563BJohnson DriveSigned as exit 63 northbound
R24.6564Victoria Avenue – Channel Islands Harbor
25.9765Telephone RoadNorthbound entrance is via Main Street
SR 126 east (Santa Paula Freeway) – Santa Clarita
Signed as exit 66 southbound; southbound entrance is via exit 1C from SR 126 west; SR 126 west exit 1A
26.7266BMain Street (US 101 Bus. north)No southbound exit
28.4568Seaward Avenue
29.4569Vista del Mar Drive, Sanjon RoadNorthbound exit and southbound entrance
30.1570ACalifornia Street, Ventura Avenue
SR 33 north (Ojai Freeway) – Ojai
31.5071Main Street (US 101 Bus. south)Southbound exit and northbound entrance
SR 1 north (PCH) – State Beaches
Northern end of SR 1 overlap; northbound exit and southbound entrance
SR 1 south (PCH) – Seacliff
Southern end of SR 1 overlap
R39.8079Mussel Shoals (Old Pacific Coast Highway)Southbound exit and entrance
41.0081La Conchita (West Surfside Street)Northbound exit and entrance
R43.5783Bates Road
VenturaSanta Barbara
county line
Northwestern end of Ventura Freeway[55]
Santa Barbara
SB R0.00-90.99
SR 150 east – Ojai, Lake Casitas
1.6185Bailard Avenue
2.6486ACasitas Pass RoadSigned as exit 86 northbound; former SR 224
3.0686BLinden AvenueSouthbound exit and northbound entrance
3.7787AReynolds Avenue, Santa Monica RoadSigned as exit 87 northbound
4.3487BCarpinteria AvenueSouthbound exit only
Toro CanyonR5.2888Padaro Lane, Santa Claus Lane
SummerlandR7.1490Padaro Lane – Summerland
R8.2691Evans Avenue – Summerland
Montecito9.0092Sheffield Drive
10.0293San Ysidro Road
10.5494AOlive Mill Road, Coast Village RoadNo northbound entrance
Santa Barbara11.1094BHermosillo RoadNorthbound exit only
11.4194CCabrillo Boulevard, Coast Village RoadNo southbound entrance; signed as exit 94B southbound
95Los Patos Way (unsigned)Southbound exit only
12.1095Salinas StreetNorthbound exit and entrance
12.7596Milpas StreetFormer SR 144; northbound exit signed as exit 96A; southbound as exits 96B and 96A
13.4996Laguna Street, Garden Street – Downtown Santa BarbaraLaguna Street/Garden Street northbound exit signed as exit 96B; Garden Street southbound exit signed as exit 96C
R14.1997Bath Street, Castillo Street; Santa Barbara Harbor
R14.7698ACarrillo Street – Downtown Santa BarbaraSigned as exit 98 southbound
15.2698BArrellaga StreetNorthbound exit and entrance
R15.7399AMission StreetSigned as exit 99 southbound
16.0599BPueblo StreetNorthbound exit only
16.55100Las Positas RoadFormer SR 225
17.78101ALa Cumbre Road, Hope Avenue
SR 154 west / State Street – Cachuma Lake
Eastern Goleta Valley18.92102El Sueno RoadNorthbound exit and entrance
20.06103Turnpike Road
Goleta21.15104APatterson AvenueSigned as exit 104 southbound
SR 217 west – Airport, UCSB
Northbound exit and southbound entrance
22.53105Fairview Avenue
23.72107Los Carneros Road
24.77108Glen Annie Road, Storke Road
26.91110Winchester Canyon Road, Hollister AvenueAll ramps are via Cathedral Oaks Road
Northern end of freeway
Southern end of freeway
30.06113Dos Pueblos Canyon Road
Northern end of freeway
Southern end of freeway
32.84116El Capitan Ranch Road
33.85117El Capitan State Beach
36.62120Refugio Road – Refugio State Beach
Northern end of freeway
Gaviota44.82128Mariposa ReinaInterchange
Gaviota State Beach (Gaviota Beach Road)At-grade intersection
Gaviota Pass46.30–
Gaviota Rest Area
47.19Gaviota Gorge Tunnel (northbound only)
Southern end of freeway
Las CrucesR48.85132
SR 1 north – Lompoc, Vandenberg SFB
Northern end of SR 1 overlap
Northern end of freeway
Southern end of freeway
BuelltonR56.46139Santa Rosa Road
R57.12140A SR 246 – Lompoc, Solvang
R57.55140BMcMurray Road, Avenue of the Flags
Northern end of freeway
Southern end of freeway
SR 154 east / Zaca Station Road – Los Olivos, Cachuma Lake
Northern end of freeway
Southern end of freeway
Los Alamos70.92154
SR 135 north – Los Alamos, Vandenberg SFB
Northern end of freeway
Southern end of freeway
78.69161Solomon Summit Undercrossing
Orcutt82.18164Clark Avenue – Orcutt
83.42166Union Valley Parkway
Santa Maria84.36167Santa Maria Way (US 101 Bus. north)
86.59169Betteravia Road – Sisquoc
87.60170Stowell Road
SR 166 west (Main Street) – Santa Maria, Guadalupe
Southern end of SR 166 overlap
89.69172Donovan Road
SR 135 south (Broadway, US 101 Bus. south) – Santa Maria
San Luis Obispo
SLO 0.00-R69.32
SR 166 east – Maricopa, Bakersfield
Northern end of SR 166 overlap
Nipomo4.85179Tefft Street – Nipomo
6.43180Willow Road
7.84182Thompson Road, Los Berros Road
Northern end of freeway
Southern end of freeway
Arroyo Grande12.52186Traffic Way (US 101 Bus. north), Fair Oaks AvenueNo northbound entrance
SR 227 north (Grand Avenue, US 101 Bus. south)
13.75187BBrisco Road, Halcyon Drive
Pismo Beach14.61188Oak Park Road
1894th Street, Five Cities DriveSigned as exits 189 (4th Street) and 190A (Five Cities Drive) southbound
16.62190Price Street (US 101 Bus. north)No northbound entrance; northbound signage
190BHinds Avenue, Price Canyon RoadNo northbound entrance; southbound signage
16.89191AWadsworth AvenueNorthbound signage; northbound entrance via Bello Street, southbound entrance via Price Street

SR 1 south – Pismo Beach
Southbound signage; north and south entrances via Price Street
17.76191BShell Beach RoadNorthbound signage
Price Street (SR 1 south, US 101 Bus. south)Southern end of SR 1 overlap; southbound signage
R19.81193Spyglass DriveNorthbound signage
Shell Beach RoadSouthbound signage
Avila BeachR21.11195Avila Beach Drive
R22.29196San Luis Bay Drive – See Canyon, Avila Beach
R24.30198Higuera Street
San Luis Obispo25.91200ALos Osos Valley RoadSigned as exit 200 southbound
26.83200BPrado Road, Elks LaneNorthbound exit and entrance
SR 227 south (Madonna Road)
28.07202AMarsh Street
28.81202BBroad Street
29.08203AOsos Street, Santa Rosa Street
SR 1 north – Morro Bay, Hearst Castle
Northern end of SR 1 overlap
29.40203CCalifornia Boulevard
29.77203DGrand Avenue – Cal PolyNorthbound exit and southbound entrance
29.99204Monterey StreetNo southbound entrance
Northern end of freeway
35.00[60]Cuesta Pass, elevation 1,522 feet (464 m)[60]
Southern end of freeway
SR 58 east – Santa Margarita
Atascadero42.27216ASanta Barbara RoadSigned as exit 216 southbound
42.90216BSan Diego WayNorthbound exit and southbound entrance
44.01218ASanta Rosa Road
44.84218BCurbaril Avenue
45.57219 SR 41 (Morro Road)
45.96220ATraffic Way (US 101 Bus. north)
46.87220BSan Anselmo Road
48.33222Del Rio Road (US 101 Bus. south)
49.32223San Ramon Road, Santa Cruz Road
Templeton50.64224Vineyard Drive (US 101 Bus. north)
51.45225Las Tablas Road
52.44226Main Street (US 101 Bus. south)
Paso Robles53.89228
SR 46 west – Cambria, Hearst Castle
Southern end of SR 46 overlap
55.67229Spring Street (US 101 Bus. north)Northbound exit and southbound entrance; former US 101
56.14230Pine StreetSouthbound exit and entrance
230Paso Robles StreetNorthbound exit and entrance
56.88231A17th StreetSouthbound exit and entrance
SR 46 east (24th Street / CR G14 west) – Fresno, Bakersfield
Northern end of SR 46 overlap; signed as exit 231 northbound
58.76232Spring Street (US 101 Bus. south)No southbound entrance; former US 101
Northern end of freeway
Southern end of freeway
San Miguel65.08239AMission Street – San MiguelNorthbound exit and southbound left entrance
65.56239B10th StreetSigned as exit 239 southbound
67.23241AMission Street – San MiguelSouthbound exit and northbound entrance
R67.71241BSouth Camp Roberts (Frontage Road)Signed as exit 241 northbound; served the former south entrance to Camp Roberts
MON R0.00-101.32
R0.84244Camp Roberts (main gate)
R2.15245East Garrison (Bradley Road)
Camp Roberts Rest Area
BradleyR7.94251Bradley (Bradley Road)
R9.67252 CR G18 (Jolon Road) – Fort Hunter Liggett
R15.47258Alvarado Road
R17.86260Los Lobos Road
R21.99263Paris Valley Road – San Ardo
R29.90271Paris Valley Road – Lockwood
San LucasR32.02273
SR 198 east – San Lucas, Coalinga
R37.31278Wild Horse Road
King CityR39.77281First Street (US 101 Bus. north / CR G15 to CR G13)
R40.72282ACanal Street
R41.18282BBroadway (US 101 Bus. south / CR G13)
R41.95283 CR G14 (Jolon Road) – Fort Hunter Liggett
Northern end of freeway
Southern end of freeway
Greenfield52.66293Espinosa Road (US 101 Bus. north, CR G16)Former US 101
53.36294AOak Avenue
53.86294BWalnut Avenue
54.79295Thorne Road (US 101 Bus. south)Former US 101
Northern end of freeway
Southern end of freeway
Soledad60.40301Arroyo Seco Road
61.59302 SR 146 (US 101 Bus. north) – SoledadFormer US 101
62.70303Front Street (US 101 Bus. south)
64.63305Camphora Gloria Road
66.40307Salinas Valley State Prison
Gonzales69.37310Gloria Road (US 101 Bus. north), Alta StreetFormer US 101
70.863115th Street
72.61313Old Stage Road (US 101 Bus. south)
Northern end of freeway
Southern end of freeway
Chualar76.97317Chualar (Main Street)
Northern end of freeway
82.47323Abbott Street (US 101 Bus. north) – SpreckelsNorthbound left exit and southbound left entrance; interchange
Southern end of freeway
Salinas85.62326AAirport Boulevard
326BFairview AvenueNorthbound exit only
86.12326CMonterey Peninsula (South Sanborn Road)Signed as exit 326B southbound
86.82327 SR 68 (John Street)
Market Street to SR 183 – Santa Cruz
R88.24329Main Street (SR 183, US 101 Bus. south)
R89.27330Laurel Drive
R91.01331Boronda Road (US 101 Bus. south)
92.19333Sala Road
Northern end of freeway
SR 156 west / Vierra Canyon Road – Monterey Peninsula
Southern end of SR 156 overlap; interchange
96.14337San Miguel Canyon Road (CR G12)Interchange
98.37339Crazy Horse Canyon Road, Echo Valley RoadInterchange
100.39Dunbarton Road to San Juan Road (CR G11)Closed in 2015 after the construction of the San Juan Road interchange
San Benito
SBT 0.00-R7.52
0.13342San Juan Road (CR G11) – Aromas, WatsonvilleInterchange
Southern end of freeway
SR 156 east – San Juan Bautista, Hollister
Northern end of SR 156 overlap
SR 129 west – Watsonville, Santa Cruz
R6.49349Betabel Road, Y Road
Northern end of freeway
Santa Clara
SCL R0.03-52.55
SR 25 south – Hollister, Pinnacles National Park
Southern end of freeway
GilroyR4.94355Monterey Road (US 101 Bus. north)
SR 152 east (Pacheco Pass Road) / 10th Street
Southern end of SR 152 overlap
SR 152 west (Leavesley Road / CR G9) – Gilroy
Northern end of SR 152 overlap
R10.27360Masten Avenue
San MartinR12.46362San Martin Avenue
Morgan HillR15.07365Tennant Avenue
R16.01366East Dunne Avenue
R17.82367Cochrane Road (US 101 Bus. south)
San JoseR21.25371Coyote Creek Golf Drive
R23.10373Bailey Avenue
SR 85 north (West Valley Freeway) – Mountain View, Cupertino
No northbound entrance; signed as exit 377B southbound; SR 85 south exit 1A

SR 85 north
HOV access only; northbound exit and southbound entrance
R27.00377BSilicon Valley Boulevard, Bernal RoadSigned as exit 377A southbound
Blossom Hill Road (CR G10) / Silver Creek Valley Road to SR 82
Southern end of Bayshore Freeway;[55] former SR 82
30.10380Hellyer Avenue
31.00381Yerba Buena RoadSouthbound exit was separated from Exit 382 in 2014
31.70382Capitol Expressway (CR G21)
33.03383Tully Road

I-280 north / I-680 north – Downtown San Jose, Sacramento
Northbound exit and southbound entrance; southern end of Joe Colla Interchange; ramps extend over the Story Road interchange; I-680 exit 1B
34.55385AStory RoadSigned as exit 385 northbound

I-280 north / I-680 north – San Francisco, Downtown San Jose, Sacramento
Southbound exit and northbound entrance; northern end of Joe Colla Interchange; I-680 exit 1B
R35.76386A SR 130 (Alum Rock Avenue) / Santa Clara Street
R36.14386BMcKee Road, Julian Street
387Mabury Road, Taylor StreetPlanned interchange
37.73388AOakland Road, 13th StreetFormer SR 238
38.30388 I-880 (Nimitz Freeway) – Oakland, Santa Cruz, Los GatosSigned as exits 388B (north) and 388C (south); I-880 exits 4B-C; former SR 17
38.80389AOld Bayshore Highway, 4th StreetNo southbound exit
39.29389BBrokaw Road, First StreetSigned as exit 389 southbound
SR 87 south (Guadalupe Parkway)
Southbound exit and northbound entrance; SR 87 north exit 9B
San JoseSanta Clara line40.70391Trimble Road, De la Cruz Boulevard (CR G6)
Santa Clara41.98392San Tomas Expressway, Montague Expressway (CR G4)
42.73393Great America Parkway, Bowers Avenue
Sunnyvale43.85394Lawrence Expressway (CR G2)
44.83395Fair Oaks AvenueSigned as exits 395A (north) and 395B (south) southbound

Mathilda Avenue to SR 237 east
Former SR 85
US 101 Express LanesSouthern end of Express Lanes
SR 237 east – Alviso, Milpitas
Southbound exit and northbound entrance; SR 237 west exit 3A
SR 237 west (Mountain View Alviso Road)
Northbound exit and southbound entrance; SR 237 east exit 3A
Mountain View47.01397Ellis Street
47.89398AMoffett Boulevard, NASA ParkwaySigned as exit 398 northbound

SR 85 Express Lanes south
Express Lanes access only; southbound exit and northbound entrance
SR 85 south – Cupertino, Santa Cruz
Southbound exit and northbound entrance; northbound exit is via exit 396C; SR 85 north exit 24B
48.60399AShoreline BoulevardSigned as exit 399 southbound
48.97399BOld Middlefield WayNorthbound exit and southbound entrance
49.61400AAmphitheatre Parkway, Rengstorff AvenueSigned as exits 400A (Amphitheatre Parkway) and 400B (Rengstorff Avenue) northbound
Mountain ViewPalo Alto line50.32400CSan Antonio RoadSigned as exits 400B (north) and 400C (south) southbound
Palo Alto52.01402Oregon Expressway (CR G3)
52.17402Embarcadero Road
San Mateo
SM 0.00-26.11
East Palo Alto0.89403University Avenue (to SR 109)
East Palo AltoMenlo Park line1.87404Willow Road (SR 114)
Menlo Park3.59406
SR 84 east (Marsh Road) – Dumbarton Bridge
Southern end of SR 84 overlap
Redwood City5.39408
SR 84 west (Woodside Road) / Seaport Boulevard
Northern end of SR 84 overlap
6.62409Whipple Avenue
San Carlos411Brittan AvenueSouthbound exit and entrance
8.40411Holly Street, Redwood Shores Parkway
412Harbor BoulevardSouthbound exit and entrance
Belmont9.55412Marine Parkway, Ralston AvenueFormer Legislative Route 214
San Mateo11.15414AHillsdale Boulevard – Foster City
11.90414B SR 92 – Hayward, San Mateo Bridge, Half Moon BaySR 92 exits 13A-B
11.90414BFashion Island BoulevardNo northbound exit
12.69415Kehoe AvenueNorthbound exit and entrance
13.464163rd AvenueFormer SR 92
14.33417ADore AvenueNorthbound exit and entrance
14.33417Poplar AvenueSouthbound exit and entrance
14.69417BPeninsula Avenue – BurlingameNorthbound exit and entrance
Burlingame16.02419AAnza BoulevardNorthbound exit and entrance
16.58419BBroadwaySigned as exit 419 southbound
Millbrae17.95421Millbrae AvenueSigned as exit 420 southbound
San Bruno19.12422 San Francisco International AirportSouthbound exit is part of exit 423A
R20.39423ASan Bruno Avenue
R20.72US 101 Express LanesNorthern end of Express Lanes

I-380 west to I-280 – San Bruno
I-380 west exit 6, east exits 6A-B
South San FranciscoR20.72423CNorth Access Road (I-380 east) – North Cargo AreaSouthbound exit is part of exit 423A
21.69424South Airport Boulevard
21.92425AGrand Avenue – Downtown South San FranciscoNo southbound entrance
22.71425BOyster Point Boulevard
425CSouth San Francisco (Airport Boulevard)Southbound exit and entrance
Brisbane23.39426ABrisbane, Cow Palace (Bayshore Boulevard)Northbound exit only
23.66426BSierra Point Parkway, Marina BoulevardSigned as exit 426 southbound; southbound exit and entrance are located 1.2 miles (1.9 km) north of northbound exit and entrance
City and County of San Francisco
SF 0.00-11.18
0.03429ATunnel Avenue – Candlestick Park
0.77429BThird Street – Cow Palace
1.11429CPaul AvenueNo northbound entrance; signed as exit 430A southbound
1.44430A I-280 – Daly City, Downtown San FranciscoNorthbound exit and southbound entrance; southern end of Alemany Maze; ramps extend over the Silver Avenue interchange; I-280 north exit 54A, south exit 54
1.77430BSilver AvenueNo northbound entrance
I-280 south – Daly City
Southbound exit and northbound entrance; northern end of Alemany Maze; I-280 north exit 54B
2.00431Alemany Boulevard, Bayshore Boulevard
2.92432Cesar Chavez Street, Potrero AvenueCesar Chavez Street was formerly Army Street
4.10433AVermont StreetNorthbound exit only
I-80 east – Bay Bridge, Oakland
Northern end of Bayshore Freeway; southern end of Central Freeway;[55] signed as exit 433 southbound; I-80 exits 1A-B
R4.55433CNinth Street – Civic CenterNorthbound exit and southbound entrance
T5.20434ADuboce AvenueNorthbound exit and southbound entrance
5.40434BOctavia Boulevard to Fell StreetNorthbound exit and southbound entrance
Northern end of Central Freeway
Market StreetNo left turns
Geary BoulevardNo left turn from northbound US 101
BroadwayNo left turns from Broadway; no left turn from northbound US 101
Van Ness Avenue, Lombard StreetNo left turn from southbound Van Ness Avenue; no left turn from westbound Lombard Street
Southern end of Presidio Parkway
Southern end of freeway
L8.59437Marina Boulevard, Girard Road – Marina, Presidio
SR 1 south (Park Presidio Boulevard) – Golden Gate Park
Southern end of SR 1 overlap
9.71439Lincoln Boulevard – View Area, Presidio, Golden Gate NRA, Fort PointNorthern end of Presidio Parkway; Lincoln Boulevard not signed northbound
Golden Gate11.18–
Golden Gate Bridge
(Southbound toll only; no state maintenance on bridge)
MRN L0.00-27.63
Sausalito0.10H. Dana Bower Rest Area and Vista Point (northbound only);
southern end of Redwood Highway
0.32442Alexander Avenue
0.89Robin Williams Tunnel under Waldo Grade
1.52443Spencer Avenue, Monte Mar Drive
2.48444Rodeo AvenueSouthbound exit and entrance connects to a dead end
3.33445ASausalito (Bridgeway), Marin City (Donahue Street)
SR 1 north – Mill Valley, Stinson Beach
Northern end of SR 1 overlap; Mill Valley not signed southbound
Strawberry4.78446Seminary Drive
Redwood Highway Frontage Road (unsigned)Southbound exit only
SR 131 east (Tiburon Boulevard) / East Blithedale Avenue
Corte MaderaCasa Buena DriveSouthbound entrance only
7.37449AParadise Drive, Tamalpais DriveSigned as exit 449 northbound
7.66449BMadera BoulevardSouthbound exit and entrance
8.02450ALucky Drive, Doherty DriveDoherty Drive not signed northbound
Larkspur8.60450BSan Anselmo, Richmond BridgeNorthbound signage
Sir Francis Drake BoulevardSouthbound signage
San Rafael9.63451AAndersen Drive, Francisco BoulevardSouthbound exit and entrance
Francisco Boulevard east to I-580 – Richmond Bridge
Northbound exit only
I-580 east – Richmond Bridge, Oakland
Southbound exit and northbound entrance; I-580 west exit 1A; former SR 17 south
10.72452Central San Rafael (Second Street, Mission Avenue)
12.19454ALincoln AvenueNo northbound exit
12.69454BNorth San Pedro RoadSigned as exit 454 northbound
13.71455Freitas Parkway – Terra Linda
14.71456Lucas Valley Road, Smith Ranch Road
15.57457St. Vincent Drive, Miller Creek Road
Novato16.64458Nave DriveNorthbound signage
Alameda del PradoSouthbound signage
18.09459Ignacio Boulevard, Bel Marin Keys Boulevard, Entrada Drive – Hamilton FieldEntrada Drive, Hamilton Field not signed northbound; signed as exits 459A (Bel Marin Keys Boulevard, Hamilton Field) and 459B (Ignacio Boulevard, Entrada Drive) southbound
SR 37 east / South Novato Boulevard – Napa, Vallejo
Signed as exits 460A (SR 37) and 460B (South Novato Boulevard) northbound
R20.19462ARowland Boulevard (US 101 Bus. north)
R21.11462BDe Long AvenueServes Downtown Novato
R22.00463Atherton Avenue, San Marin Drive (US 101 Bus. south)
26.90467San Antonio Road, Silveira Ranch Road
Sonoma2.94472APetaluma Boulevard South (US 101 Bus. north), Kastania Road
SR 116 east – Sonoma, Napa
Southern end of SR 116 overlap
4.76474East Washington Street – Central Petaluma
5.76476Old Redwood Highway, Petaluma Boulevard North (US 101 Bus. south) – Penngrove
Stony Point RoadSouthbound entrance only
10.67479Railroad AvenueNorthbound exit only
Cotati12.00481AWest Sierra AvenueNorthbound exit and southbound entrance
SR 116 west (Gravenstein Highway) – Rohnert Park, Sebastopol, Cotati
Northern end of SR 116 overlap; signed as exit 481 southbound
Rohnert Park13.88483Rohnert Park Expressway
15.02484AGolf Course Drive, Wilfred AvenueSigned as exit 484 southbound
15.53484BSanta Rosa Avenue (US 101 Bus. north)Northbound exit and southbound entrance
16.54485Todd Road
Santa Rosa18.49487Yolanda Avenue, Hearn AvenueYolanda Avenue not signed southbound
19.00488ABaker AvenueNorthbound signage
Corby Avenue, Santa Rosa AvenueSouthbound signage
19.66488B SR 12 – Sebastopol, SonomaSR 12 west exits 7A-B, east exit 7
20.09489Third Street – Downtown Santa RosaThird Street not signed southbound
20.74490College Avenue
21.74491ASteele Lane, Guerneville RoadSigned as exit 491 southbound
22.52491BBicentennial WayNorthbound exit and southbound entrance
22.81492Mendocino Avenue (US 101 Bus. south), Old Redwood Highway, Hopper AvenueHopper Avenue not signed northbound; Old Redwood Highway not signed southbound
24.86494River Road – Guerneville, Calistoga
25.90495AFulton Road – FultonClosed after the reconstruction of the Airport Boulevard interchange
26.33495Airport Boulevard, Fulton Road – Fulton
Windsor27.62496Shiloh Road
29.35498Old Redwood Highway – Central Windsor
30.67499Arata LaneNo northbound entrance
Healdsburg33.48502Healdsburg AvenueNorthbound signage
Old Redwood HighwaySouthbound signage
34.55503Central Healdsburg (Healdsburg Avenue)Northbound exit and southbound entrance
34.88504Westside Road – GuernevilleSouthbound exit and northbound entrance
36.27505Dry Creek Road
R38.56507Lytton Springs Road, Alexander Valley Road
R40.03509Independence Lane

Geyserville Avenue to SR 128 east – Geyserville
SR 128 east / Canyon Road (CR C1) – Geyserville, Calistoga
Southern end of SR 128 overlap
R47.85517Asti (Asti Road)
R49.05518Dutcher Creek Road – Stewarts Point
CloverdaleR50.43519South Cloverdale Boulevard (US 101 Bus. north, SR 128 Bus. west)
R51.62520Citrus Fair Drive
SR 128 west (US 101 Bus. south) – Fort Bragg, Mendocino
Northern end of SR 128 overlap
MEN R0.10-T106.80
0.48525Geysers Road
Northern end of freeway
SR 175 east – Lakeport
Southern end of freeway
19.68544Burke Hill Drive
20.71545Cox-Shrader Road
SR 253 west – Ukiah, Boonville
UkiahR23.45548ATalmage (SR 222)
R24.06548BGobbi Street
R24.53549Perkins Street, Vichy Springs Road – Central Ukiah
R26.16551North State Street – Ukiah
27.41552Lake Mendocino Drive
30.43555ACalpella (Moore Street, Central Avenue)
SR 20 east – Upper Lake, Williams
Southern end of SR 20 overlap
R32.63557West Road – Redwood Valley
Northern end of freeway
41.06[60]Ridgewood Summit, elevation 1,956 feet (596 m)[60]
Southern end of freeway
SR 20 west – Willits, Fort Bragg
Northern end of SR 20 overlap; former US 101 north
573North Main StreetFormer US 101 south
Northern end of freeway
58.90Moss Cove Rest Area (southbound only)
SR 162 east – Covelo, Round Valley
61.82Irvine Lodge Road – Irvine Lodge Rest AreaNo left turn from US 101 south
82.50Empire Camp Rest Area (northbound only)
Southern end of freeway
SR 271 north
Former US 101 north
South LeggettR89.57614South Leggett (SR 271)Former US 101
Northern end of freeway
SR 1 south – Leggett, Fort Bragg
Former SR 208 south
South Fork Eel RiverR99.51–
Confusion Hill Bridges
Southern end of freeway
ReynoldsR101.89625 SR 271Former US 101
PiercyR103.81627Piercy (SR 271)Former US 101
HUM T0.00-R137.44
Northern end of freeway
Cooks ValleyT0.08
SR 271 south – Piercy, Cooks Valley
Former US 101 south
Southern end of freeway
BenbowR8.60636Benbow (Lake Benbow Drive)
GarbervilleR11.13639ASprowel Creek Road (US 101 Bus. north) – GarbervilleNo northbound entrance
R11.50639BGarberville, Redway (Redwood Drive)No southbound entrance
R14.31642Redwood Drive (US 101 Bus. south) – Redway
R17.91645Avenue of the Giants (SR 254), Hooker Creek Road – PhillipsvilleHooker Creek Road not signed northbound; Avenue of the Giants not signed southbound
R22.44650Miranda, Phillipsville (Maple Hills Road)
25.01653Salmon Creek Road
Myers Flat27.94656Myers Flat (SR 254)
33.22661Weott (Newton Road)
35.70663South Fork, Honeydew (SR 254)
39.16667AAvenue of the Giants (SR 254)Southbound exit only
R39.67667Redcrest, Holmes (Sorenson Road)
R43.32671Pepperwood, Redcrest, Holmes (Barkdull Road)
R45.90674Avenue of the Giants (SR 254), Jordan Road – PepperwoodAvenue of the Giants not signed northbound; Jordan Road not signed southbound
R47.95676Stafford Road
Northern end of freeway
Southern end of freeway
R51.84679Rio Dell, Scotia (SR 283, US 101 Bus. north)
Rio DellR52.60680Davis Street
R53.38681Wildwood Avenue (US 101 Bus. south) – Rio Dell
Northern end of freeway
Southern end of freeway
SR 36 east – Hydesville, Bridgeville
59.50687Kenmar Road (US 101 Bus. north), Riverwalk DriveRiverwalk Drive not signed southbound
60.4968812th Street
61.53689Main Street (US 101 Bus. south)
62.23690Palmer Boulevard
Fernbridge63.10691Fernbridge, Ferndale (Fernbrige Drive to SR 211)Northbound exit and southbound entrance
64.30692Loleta, Fernbridge, Ferndale (SR 211)
65.95694Loleta Drive
68.21696Hookton Road – Loleta
Eureka70.61698College of the Redwoods (Tompkins Hill Road)
72.03699Fields Landing (Orchard Avenue, Fields Landing Drive)
72.88700King Salmon Avenue
73.72701Humboldt Hill Road – Humboldt Hill
74.77702Herrick Avenue, Elk River Road
Northern end of freeway
SR 255 north (R Street) / Myrtle Avenue – Samoa
ArcataSouthern end of freeway
85.03712South G StreetSouthbound exit and entrance
SR 255 south (Samoa Boulevard) – Arcata, Samoa, Sunny Brae
86.50714A14th Street – Humboldt State UniversityNorthbound exit and southbound entrance
86.94714BSunset Avenue – Arcata, Humboldt State UniversitySigned as exit 714 southbound
SR 299 east – Weaverville, Redding
88.80716BGiuntoli Lane, Janes Road
SR 200 east (North Bank Road) / Central Avenue (US 101 Bus. north) – McKinleyville
Central Avenue not signed southbound
R91.47719School Road
R93.00721Murray Road
R93.85722 Arcata–Eureka Airport (Airport Road)
R95.62723North Central Avenue (US 101 Bus. south) – McKinleyville
R97.02725Crannell Road
98.07726AWesthaven DriveNorthbound exit and southbound entrance
98.36726B6th Avenue – WesthavenSigned as exit 726 southbound
Trinidad100.71728Trinidad (North Westhaven Drive, Main Street)
R102.90Trinidad – Southbound Rest Area
R103.37731Seawood Drive
R105.14Trinidad – Northbound Rest Area
R106.06734Patricks Point Drive
Northern end of freeway
Southern end of freeway
R126.09753Newton B. Drury Scenic Parkway northFormer US 101 north
Del Norte
DN M0.00-46.49
R0.15765Newton B. Drury Scenic Parkway southFormer US 101 south
R3.56768Klamath Beach Road (CR D8)
SR 169 east – Klamath, Terwer Valley
Northern end of freeway
Requa Road (CR D7) / Minot Creek Road
Crescent City25.84Elk Valley Road (CR D2) – Elk Valley Rancheria
27.01 CR D3 (Northcrest Drive)
Parkway Drive to Washington BoulevardNorthbound exit and entrance; interchange
Southern end of freeway
R27.87791Washington Boulevard (CR D1)No northbound exit

US 199 north (Redwood Highway north) to I-5 – Grants Pass
Northbound exit and southbound entrance; US 101 south transitions onto Redwood Highway south
Northern end of freeway

Elk Valley Cross Road (CR D2) to US 199 – Grants Pass
Lake Earl Drive (CR D3) – Pelican Bay State Prison
SR 197 south (North Bank Road)
Fred D. Haight Drive (CR D4)
Smith River39.83Fred D. Haight Drive (CR D4) – Smith River
Sarina Road, Ocean View Drive (CR D5)
Smith River RancheriaMouth Smith River Road (CR D6)
Ocean View Drive (CR D5)
46.20Agricultural Inspection Station (southbound only)
US 101 north – Oregon Coast, Portland
Continuation into Oregon
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


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External links

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