US 12 merges with WIS 312 east (North Crossing) for two miles (3.2 km) before turning south onto Clairemont Avenue, bypassing downtown Eau Claire to the south and west. US 12 passes through Elk Mound and enters Eau Claire County. The highways meet an interchange with I-94, then split one half of a mile (0.80 km) east in Elk Mound at the junction with WIS 40. US 12 turns east onto WIS 29 (Main Street East) in downtown Menomonie, and the two routes follow Stout Road east out of the city. Roughly three miles (4.8 km) into Dunn County, US 12 passes through Knapp then turns southeastward, connecting with WIS 79 six miles (9.7 km) further it then joins WIS 25 (North Broadway Street) to the south in Menomonie. US 12 passes through Woodville four miles (6.4 km) east of Baldwin and crosses WIS 128 in Wilson, two miles (3.2 km) west of the Dunn County line. The highway crosses WIS 65 in Roberts and passes through Hammond over a 15-mile (24 km) segment to Baldwin, where it crosses US 63.

US 12 leaves I-94 one mile (1.6 km) further east from the eastern WIS 35 exit, treks two miles (3.2 km) north, and parallels the Interstate. Wisconsin Highway 35 (WIS 35) joins both routes upon their entry into Wisconsin and exits south three miles (4.8 km) east. Croix River from Minnesota concurrent with I-94 into St. Paul, Minneapolis and Omaha Railway, now operated by Union Pacific Railroad.

Between Hudson and west of Warrens, the road closely parallels the former main line of the Chicago, St. The remainder of the road is a two-lane surface road or an urban multilane arterial. 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. Finally, it serves southeastern Wisconsin, connecting Madison with Fort Atkinson, Whitewater, Elkhorn, and Lake Geneva. It then provides an alternative route for traffic between northwestern Wisconsin and Madison and is the anchor route for the Beltline Highway around Madison. 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. state of Wisconsin runs east–west across the western to southeast portions of the state. Highway 12 ( US 12 or Highway 12) in the U.S. Croix, Dunn, Chippewa, Eau Claire, Clark, Jackson, Monroe, Juneau, Sauk, Dane, Jefferson, Rock, Walworth

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