U.S. Route 12 in Wisconsin

U.S. Highway 12
Iron Brigade Memorial Highway
US 12 highlighted in red, existing business routes highlighted in blue
Route information
Maintained by WisDOT
Length	339.40 mi[1] (546.21 km)
Existed	1926–present
History	Designated in 1917 as WIS 12
Major junctions
West end	I-94 / US 12 in Hudson
Major intersections	I-90 / I-94 in multiple locations US 63 in Baldwin US 53 in Altoona US 10 in Cleveland/Mentor US 14 in Middleton US 18 / US 151 in Madison US 51 in Madison I-39 / I-90 in Madison US 18 in Cambridge I-43 in Elkhorn
East end	US 12 in Genoa City
Location
Country	United States
State	Wisconsin
Counties	St. Croix, Dunn, Chippewa, Eau Claire, Clark, Jackson, Monroe, Juneau, Sauk, Dane, Jefferson, Rock, Walworth
Highway system
United States Numbered Highway System List Special Divided Wisconsin State Trunk Highway System Interstate US State Scenic Rustic
← WIS 11 → WIS 13

U.S. Highway 12 (US 12 or Highway 12) in the U.S. state of Wisconsin runs east–west across the western to southeast portions of the state. It enters from Minnesota running concurrently with Interstate 94 (I-94) at Hudson, parallels the Interstate to Wisconsin Dells, and provides local access to cities such as Menomonie, Eau Claire, Black River Falls, Tomah, and Mauston. It then provides an alternative route for traffic between northwestern Wisconsin and Madison and is the anchor route for the Beltline Highway around Madison. Finally, it serves southeastern Wisconsin, connecting Madison with Fort Atkinson, Whitewater, Elkhorn, and Lake Geneva. The West Beltline Highway and the segment between Elkhorn and Genoa City are freeways, and the segment between Sauk City and Middleton is an expressway. The remainder of the road is a two-lane surface road or an urban multilane arterial. Between Hudson and west of Warrens, the road closely parallels the former main line of the Chicago, St. Paul, Minneapolis and Omaha Railway, now operated by Union Pacific Railroad.