U.S. Route 18 in Wisconsin

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U.S. Highway 18

US 18 highlighted in red
Route information
Maintained by WisDOT
Length182.16 mi[1] (293.16 km)
Major junctions
West end US 18 in Prairie du Chien
Major intersections
East endLincoln Memorial Drive in Milwaukee
CountryUnited States
CountiesCrawford, Grant, Iowa, Dane, Jefferson, Waukesha, Milwaukee
Highway system
WIS 17 WIS 18

U.S. Highway 18 (US 18) in the state of Wisconsin runs east–west across the southern part of the state. The highway serves as major connecting route between Madison and the southwest corner of the state. East of Madison, the route is paralleled by Interstate 94 (I-94) and serves as a local connection route to the communities along the Interstate. US 18 enters Wisconsin at Prairie du Chien and ends in downtown Milwaukee at Lincoln Memorial Drive, across from the Milwaukee Art Museum.

Route description

US 18 enters Crawford County from Iowa, crossing the Mississippi River using the Marquette–Joliet Bridge just west of Prairie du Chien. State Trunk Highway 60 (WIS 60) begins at the state line and runs concurrent with US 18 east from there. The two highways turn south at the along with WIS 35 downtown and head southeast out of the city. WIS 60 branches northeast from US 18 at Bridgeport. US 18 and WIS 35 continue southeast into Grant County[2] The two highways split at Patch Grove with WIS 35 continuing southeastward along with WIS 133 south, while US 18 turns eastward along with WIS 133 north. WIS 133 branches north at Mount Hope. US 18 and US 61 junction in downtown Fennimore, and WIS 80 north joins the highway in Montfort, on the Iowa County line.[3]

US 18/WIS 133 in Patch Grove

WIS 80 turns north at Cobb while US 18 continues east through Dodgeville, crossing WIS 23 and joining US 151 north. The two U.S. Highways share a common expressway and bypass Ridgeway and Barneveld on the way east into Dane County.[4] In Dane County, US 18 and US 151 bypass Mount Horeb, crossing WIS 78 and WIS 92, and Verona and enter the Madison area, first passing through Fitchburg. Upon entering Madison, US 18 and US 151 join US 12 and US 14 east along the West Beltline Highway. US 151 and US 14 turn off the beltline three miles (4.8 km) east and US 12 and US 18 continue east, crossing US 51 and I-39/I-90 southeast of Madison. Four miles (6.4 km) east of the Interstates, US 12/US 18 becomes a two-lane surface road again and passes through Cambridge, where US 12 splits southeast at the Jefferson County line.[5]

US 18 crosses WIS 89 and WIS 26 in Jefferson and passes through Sullivan.[6] Entering Waukesha County, US 18 passes north of Dousman at WIS 67, south of the Lapham Peak Unit, Kettle Moraine State Forest, and north of Wales at WIS 83.[7] US 18 then enters Waukesha along Summit Avenue. US 18 turns south from Summit Avenue on the new section of Les Paul Parkway (also known as the new Waukesha West Bypass) and goes the entire route of Les Paul Parkway going around the west, south, and east areas of the city of Waukesha along with the current WIS 59 and WIS 164 configuration from County Trunk Highway X (CTH X), and US 18 joins back up at Moreland Boulevard at the northeast terminus at the Les Paul Parkway/Wolf Road intersection. So US 18 is now rerouted by using Les Paul Parkway and does not go through downtown Waukesha anymore. WIS 164 turns west onto I-94, and US 18 continues east into Brookfield along Blue Mound Road.[8] US 18 continues through Brookfield and Elm Grove along Blue Mound Road and enters Milwaukee County and Wauwatosa.[7] US 18 crosses WIS 100, US 45, US 41, and I-41 near the Milwaukee County Zoo and continues east into Milwaukee.[9] At WIS 175, the highway shifts onto Wisconsin Avenue. US 18 turns north onto North 35th Street and east on to West Highland Avenue where it crosses I-43 near Downtown Milwaukee. US 18 turns south on 6th Street. The east- and westbound lanes split at State and 6th streets; eastbound continues south on 6th Street and then east on Wells Street. US 18 eastbound joins WIS 32 at North Broadway (southbound) and North Milwaukee Street (Northbound). Both directions turn east onto East Michigan Street as WIS 32 continues south. Westbound US 18 follows Milwaukee Street north from Michigan Street, turns west on State Street. At 6th Street, westbound US 18 reaches its eastern terminus, the junction of Michigan Street and Lincoln Memorial Drive five blocks east of WIS 32, and one block north of I-794.[10]


The old US 18 bridge over the Wisconsin River in Bridgeport

Prior to 1926, the route that US 18 follows today was designated as WIS 19.[11] By 1923, the WIS 19 extended from Prairie du Chien to Milwaukee.[12] Shortly after US 18 was signed, it was rerouted along WIS 30 and WIS 19—the present route within Milwaukee. The remainder of the route was relocated to its current alignment in 1932.[1][13]

The eastern terminus was an originally stated in official Wisconsin Department of Transportation documentation to be the junction of East Michigan Street and North Harbor Drive. This matched what commercial street maps were showing after many years of inaccuracies.[1]

Between 1980 and 1992, 38 miles (61 km) of US 18/US 151 was widened to expressway standards between Dodgeville and Madison. With the exception of a bypass around Verona, it was the final piece to be completed later in 1995 at a cost of $31 million (equivalent to $56.6 million in 2023[14]). US 12/US 18 was widened to expressway standards between I-39/I-90 to North Star Road, west of Cambridge. The remainder was not expanded but straightened out to eliminate sharp curves.[1]

In 2019, as part of the construction to complete the Waukesha Bypass, US 18 has been rerouted as Temporary US 18 from WIS 83 in Wales, north along WIS 83 to I-94 and east along I-94 to exit 297 at Blue Mound Road where it rejoins the previous route.

That same year, two new interchanges opened in Fitchburg, replacing at-grade intersections with McKee Road (CTH PD) and Williamsburg Way.

Major intersections

Mississippi River0.000.00
US 18 west – Marquette, Charles City
Continuation into Iowa
Marquette–Joliet Bridge; Iowa–Wisconsin state line; western end of WIS 60 concurrency
CrawfordPrairie du Chien1.42.3
WIS 27 north – Eastman
WIS 35 north – Lynxville
Western end of WIS 35 concurrency
WIS 60 east – Wauzeka
Eastern end of WIS 60 concurrency
GrantTown of Patch Grove14.323.0

WIS 35 south / WIS 133 south – Cassville Ferry
Eastern end of WIS 35 concurrency; western end of WIS 133 concurrency
Mount Hope20.232.5
WIS 133 north – Boscobel
Eastern end of WIS 133 concurrency
US 61 north – Boscobel
Western end of US 61 concurrency
US 61 south – Lancaster
Eastern end of US 61 concurrency
county line
WIS 80 south – Platteville
Western end of WIS 80 concurrency
WIS 80 north – Highland, Muscoda
Eastern end of WIS 80 concurrency
Town of Linden51.582.9 WIS 39 – Linden, Mineral Point
Dodgeville58.694.3 WIS 23 – Mineral Point, Spring Green
Town of Dodgeville60.397.047
US 151 south – Dubuque
Western end of US 151 concurrency
Town of Ridgeway65.3105.152
CTH-BB south (Ridgevue Road) / CTH-HHH – Ridgeway
Opened in 2018
Barneveld71.6115.258 CTH-ID – Barneveld
DaneTown of Blue Mounds78.9127.065

Bus. US 18 / Bus. US 151 / WIS 78 – Mount Horeb, Blanchardville
US 18 Business / US 151 Business only signed northbound
Mount Horeb82.2132.369

Bus. US 18 / Bus. US 151 / CTH-ID – Mount Horeb
US 18 Business / US 151 Business only signed southbound
Town of Springdale84.0135.270
CTH-PD to CTH-P – Cross Plains
Town of Verona88.7142.775 CTH-G (Dairy Ridge Road) – Mount Vernon

Bus. US 18 / Bus. US 151 / CTH-MV (W. Verona Avenue) / Epic Lane
US 18 Business / US 151 Business only signed eastbound
91.0146.577 WIS 69 – Belleville, New Glarus

CTH-PB to CTH-M / Alt. US 18 / Alt. US 151 – Paoli, Oregon
Alternate US 18 and Alternate US 151 only signed eastbound
Town of Verona94.0151.381

Bus. US 18 / Bus. US 151 / CTH-MV – Verona
Southbound exit and northbound entrance only
Fitchburg96.4155.183A CTH-PD (McKee Road)
97.0156.183BWilliamsburg Way

US 12 west / US 14 west (Beltline Highway) / Midvale Boulevard – Dodgeville
Western end of US 12 and US 14 concurrencys.
98.7158.8258ASeminole HighwayWestbound exit and eastbound entrance only
99.8160.6259Todd Drive
100.6161.9260 CTH-D (Fish Hatchery Road)Eastbound exits signed 260A (south) and 260B (north)

US 14 east / US 151 north (Park Street) / Alt. US 18 / Alt. US 151 – Oregon
Eastern end of US 14 and US 151 concurrencys; Alternate US 18 and Alternate US 151 only signed eastbound
102.1164.3262 CTH-MM (Rimrock Road)
102.6165.1263John Nolen Drive
CTH-BW east (West Broadway)
104.9168.8265Monona Drive
Madison105.8170.3266 US 51 (Stoughton Road)
I-39 / I-90 to I-94 – Janesville, Chicago, Wisconsin Dells, Milwaukee
Signed as exits 267A (east/south) and 267B (west/north); I-39 / I-90 exit 142
108.9175.3269 CTH-ABNew interchange to be constructed in September 2022 with a completion date of late October 2023.
Town of Cottage Grove111.4179.3272 CTH-N – Cottage Grove, Stoughton
Town of Deerfield118.0189.9 WIS 73 – Deerfield, EdgertonInterchange
WIS 134 north
US 12 east – Fort Atkinson
Eastern end of US 12 concurrency
JeffersonTown of Jefferson129.8208.9
WIS 89 north – Lake Mills
Western end of WIS 89 concurrency
WIS 89 south – Fort Atkinson
Eastern end of WIS 89 concurrency
130.8210.5 WIS 26 – Fort Atkinson, Johnson CreekInterchange
Bus. WIS 26 (Main Street)
WaukeshaDousman150.8242.7 WIS 67 – Oconomowoc, Eagle
Wales155.0249.4 WIS 83 – Hartland, MukwonagoRoundabout
WIS 318 north (Meadowbrook Road)

CTH-TT south (Merlin Hills Road)
WIS 164 south
Western end of WIS 164 concurrency
I-94 / WIS 164 north – Milwaukee, Madison
Eastern end of WIS 164 concurrency
MilwaukeeWauwatosa177.6285.8 WIS 100 (N. 108th Street)
178.3286.9 I-41 / US 41 / US 45
179.2288.4 WIS 181 (Glenview Avenue)
To WIS 175 / Wisconsin Avenue
WIS 57 south (N. 27th Street)
Western end of WIS 57 concurrency
WIS 57 north (N. 20th Street)
Eastern end of WIS 57 concurrency
I-43 north – Green Bay
Northbound I-43 entrance and southbound I-43 exit only
WIS 145 north (N. 6th Street)
Western end of WIS 145 concurrency
WIS 145 ends
Eastern end of WIS 145 concurrency
WIS 32 north (E. Wells Street)
Western end of WIS 32 concurrency

WIS 32 south (E. Michigan Street)
Eastern end of WIS 32 concurrency
Lincoln Memorial Drive
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b c d Bessert, Chris. "Wisconsin Highways: Highways 10-19 (U.S. Highway 18)". Wisconsin Highways. Retrieved January 1, 2008.
  2. ^ Crawford Co (pdf) (Map). Wisconsin Department of Transportation. Retrieved January 1, 2008.
  3. ^ Grant Co (pdf) (Map). Wisconsin Department of Transportation. Retrieved January 1, 2008.
  4. ^ Iowa Co (pdf) (Map). Wisconsin Department of Transportation. Retrieved January 1, 2008.
  5. ^ Dane Co (PDF) (Map). Wisconsin Department of Transportation. Archived from the original (pdf) on June 14, 2011. Retrieved January 1, 2008.
  6. ^ Jefferson Co (PDF) (Map). Wisconsin Department of Transportation. Archived from the original (pdf) on April 13, 2007. Retrieved January 1, 2008.
  7. ^ a b Waukesha Co (PDF) (Map). Wisconsin Department of Transportation. Archived from the original (pdf) on April 15, 2007. Retrieved January 1, 2008.
  8. ^ City of Waukesha Ward and Aldermanic Districts Map (pdf) (Map). City of Waukesha. Retrieved January 1, 2008.
  9. ^ Milwaukee Co (PDF) (Map). Wisconsin Department of Transportation. Archived from the original (pdf) on January 25, 2007. Retrieved January 1, 2008.
  10. ^ Google (January 1, 2008). "US-18, Milwaukee" (Map). Google Maps. Google. Retrieved January 1, 2008.
  11. ^ Official Auto Trails Map (Map). 1:1,081,344. Rand McNally. 1921. p. 330-331.
  12. ^ "Complete Plans for Roadwork". Telegraph-Herald. Dubuque, Iowa. April 2, 1923. p. 5. Retrieved January 8, 2011.
  13. ^ "Rand McNally Auto Road Atlas". Rand McNally. 1926. Retrieved January 1, 2008.
  14. ^ Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved November 30, 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth series.

External links

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