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State Trunk Highway 175
State Trunk Highway 175
	WIS 175 highlighted in red
Route information
	Maintained by WisDOT
Length	51.4 mi (82.7 km)
Major junctions
South end	WIS 59 in West Milwaukee
	I-94 in Milwaukee; US 18 in Milwaukee; I-41 / US 41 / US 45 / WIS 100 in Milwaukee;
North end	US 151 in Fond du Lac
Location
Country	United States
State	Wisconsin
Counties	Milwaukee, Waukesha, Washington, Dodge, Fond du Lac
Highway system
	Wisconsin State Trunk Highway System; Interstate; US; State; Scenic; Rustic;

State Trunk Highway 175 (often called Highway 175, STH-175 or WIS 175) is a state highway in the US state of Wisconsin. It runs north–south in central Wisconsin from West Milwaukee to just south of Fond du Lac.

The highway follows the former route of U.S. Highway 41 (US 41) before US 41's current route was created between 1953 and 1955. Portions of the highway were part of the Yellowstone Trail. North Fond du Lac created a park dedicated to the trail, which was the first transcontinental automobile highway through the upper tier of states in the United States.

History

Commemorative sign along former WIS 175 at Yellowstone Trail Park in North Fond du Lac

The highway was shorted by 17.1 miles (27.5 km) on January 1, 2007. The northern terminus was moved from US 45 near Oshkosh to its present location near Fond du Lac. The portion in Winnebago County became County Trunk Highway R (CTH-R), and the portion in Fond du Lac County (including through the Van Dyne, North Fond du Lac, and Fond du Lac communities) became CTH-RP.^[2]

Numerous segments of the highway are marked for changing to local control, including segments in Washington County. It formerly went into the city of Fond du Lac before the 2010s, when the city's highway designations changed with the completion of the US 151 bypass.

Beginning in May 2015, US 41 south of Howard underwent conversion to Interstate 41 (I-41) and rerouted to follow an existing freeway alignment in Milwaukee County. Beginning the following month, WIS 175 signs began replacing US 41 signs in the Milwaukee area, where the designation was extended beyond I-94 along the Stadium Freeway, also replacing WIS 341 between the Stadium Interchange and WIS 59.^[3]

In 2022, the Wisconsin Department of Transportation began exploring reconstructing Highway 175 in Milwaukee between North Avenue and Vliet Street in the Washington Heights neighborhood of Milwaukee.^[4] In 2016, Urban Milwaukee contributor John O'Neill wrote an article suggesting partial removal of the highway in order to improve pedestrian safety.^[5]

Major intersections

County	Location	Exit	Destinations	Notes
Milwaukee	West Milwaukee		WIS 59 (National Avenue)	Southern terminus; southern end of freeway
	Milwaukee	—	American Family Field / Canal Street
		38	I-94 – Milwaukee, Madison	Only numbered southbound
		—	US 18
		—	State Street / Vliet Street
		—	Washington Boulevard	Northbound exit only
		—	Lloyd Street	No southbound exit
			Lisbon Avenue	Northern end of freeway
			WIS 190
			WIS 181
			WIS 181
		—	I-41 / US 41 / US 45 / WIS 100 / Metro Auto Mall	No access to southbound I-41 from northbound WIS 175 or northbound I-41 from southbound WIS 175; Metro Auto Mall northbound exit only
Washington	Richfield		WIS 167	Roundabout
	Richfield		WIS 145	Northern terminus of WIS 145
	Town of Polk		To WIS 164	Grade-separated
	Slinger		WIS 60 – Hartford, Grafton
	Slinger		WIS 144 north	Southern terminus of WIS 144
	Town of Hartford		WIS 83 south – Hartford	Northern terminus of WIS 83
	Addison		WIS 33 – Horicon, Allenton
Dodge	Theresa		WIS 28 west / WIS 67 south – Mayville	Southern end of WIS 28/WIS 67 concurrency
	Town of Theresa		WIS 28 east – Kewaskum	Northern end of WIS 28 concurrency
	Lomira		WIS 67 north	Northern end of WIS 67 concurrency
	Town of Lomira		WIS 49 – Brownsville
Fond du Lac	Fond du Lac		US 151	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Incomplete access