Interstate 505

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Interstate 505

I-505 highlighted in red
Route information
Auxiliary route of I-5
Maintained by Caltrans
Length32.99 mi[1] (53.09 km)
NHSEntire route
Major junctions
South end I-80 in Vacaville
Major intersections
North end I-5 near Dunnigan
CountryUnited States
CountiesSolano, Yolo
Highway system
SR 480 I-580

Interstate 505 (I-505) is a north–south auxiliary Interstate Highway in the Sacramento Valley in Northern California. It is a spur auxiliary route of I-5 that runs from near Dunnigan south to I-80 in Vacaville. I-505 is primarily a rural Interstate, but travels through Vacaville and the city of Winters. The highway is the primary route connecting the San Francisco Bay Area and the northern Sacramento Valley, bypassing Sacramento and its attendant city traffic. Thus, it is a major route for travelers heading directly from the San Francisco Bay Area to the Pacific Northwest.

Power lines connecting Path 15 to Path 66 follow the highway for a while, until one heads northeast and the other northwest.

Route description

I-505 at Vaca Valley Parkway

The southern terminus of I-505 is at I-80 next to the Nut Tree Airport in the Nut Tree area in Vacaville. From there, it travels north about 10 miles (16 km) through rural areas near the western edge of the Sacramento Valley before reaching Winters. I-505 then skirts the eastern city limits of Winters, intersecting with State Route 128—the only exit in Winters. After leaving that city, the Interstate then proceeds north through rural areas again for about 20 miles (32 km) until it reaches its northern terminus with I-5 near Dunnigan.

For its entire length, I-505 is a four-lane freeway (two lanes in each direction) with a maximum speed limit of 70 mph (110 km/h), which is typical for rural Interstates in California.

I-505 is part of the California Freeway and Expressway System,[2] and is part of the National Highway System,[3] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[4]


I-505 was designated by the California State Legislature in the 1964 state highway renumbering.[5] What is now I-505 was originally conceived as part of a loop Interstate with a directional suffix, I-5W.[6] However, I-5W and most of the other Interstates around the country with directional suffixes were eventually renumbered or eliminated, except I-35E and I-35W in Texas and Minnesota. I-69 segments I-69W, I-69C, and I-69E in southern Texas have since been designated as well. The former route of I-5W now corresponds to I-580 from I-5 south of Tracy to Oakland, I-80 from Oakland to Vacaville, and I-505 from Vacaville to I-5 near Dunnigan.

The northernmost section of I-505, between SR 16 in Madison and I-5 near Dunnigan, opened in August 1977.[7]

Exit list

SolanoVacaville0.000.001 I-80 – San Francisco, SacramentoSouthern terminus; southbound exit and northbound entrance; signed as exit 1A (west) and 1B (east); I-80 exit 56
0.000.00Orange Drive / Nut Tree RoadNorthbound exit (from I-80 east ramp) and entrance
0.000.001BMonte Vista AvenueSouthbound exit and entrance (to I-80 east)
1.452.331CVaca Valley ParkwaySigned as exit 1 northbound
3.064.923Midway Road
5.578.966Allendale Road
10.4316.7910Putah Creek Road
SR 128 west (Grant Avenue / Russell Boulevard / CR E6 east) – Winters, Davis
Eastern terminus of SR 128; western terminus of CR E6
14.6623.5915Road 29A
17.1627.6217Road 27
21.2534.2021 SR 16 – Woodland, Esparto
24.0638.7224Road 19
28.0845.1928Road 14 (CR E10) – Zamora
30.7449.4731Road 12A
I-5 north – Redding
Northbound exit and southbound entrance; northern terminus; no access to I-5 south; I-5 south exit 553
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ California Department of Transportation (October 2014). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
  2. ^ "Article 2 of Chapter 2 of Division 1". California Streets and Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
  3. ^ Federal Highway Administration (March 25, 2015). National Highway System: California (North) (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved July 29, 2017.
  4. ^ Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
  5. ^ California State Assembly. An act to add Section 253 and Article 3 (commencing with Section 300) to Chapter 2 of Division 1 of, and to repeal Section 253 and Article 3 (commencing with Section 300) of Chapter 2 of Division 1 of, the... 1963 Session of the Legislature. Statutes of California. State of California. Ch. 385.
  6. ^ "California Highways-Routes 1-8". California Highways. Retrieved 2012-09-03.
  7. ^ "I-505 Stretch In Yolo To Open". The Sacramento Bee. August 11, 1977. p. B2. Retrieved November 26, 2021 – via
  8. ^ a b California Department of Transportation, California Numbered Exit Uniform System, Interstate 505 Freeway Interchanges, Retrieved on 2009-02-07.

External links