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US Route 51 in Wisconsin

US Highway 51 marker

US Highway 51
Route information
Maintained by WisDOT
Length: 316.59 mi (509.50 km)
Existed: November 11, 1926 (1926-11-11) – present
Major junctions
South end: US 51 in Beloit
 
North end: US 2 in Hurley
Location
Counties: Rock, Dane, Columbia, Marquette, Waushara, Portage, Marathon, Lincoln, Oneida, Vilas, Iron
Highway system
WIS 50 WIS 52

US Highway 51 marker

U.S. Highway 51 (US 51) in the U.S. state of Wisconsin runs north–south down the central part of the state. It enters from Illinois at Beloit, and runs north to its northern terminus in Hurley where it junctions with US 2. Much of the route of US 51 runs concurrently with Interstate 39 (I-39).

From Beloit, US 51 passes through Janesville and Edgerton. US 51 joins with I-39 and I-90 for about five miles (8.0 km) before splitting off and heading west to Stoughton. US 51 then passes through the east side of Madison as a side route, known locally as Stoughton Road, paralleling to the west of I-39/I-90. North of Madison, US 51 parallels the Interstates on the east side passing through De Forest, Leeds, North Leeds, Poynette and Portage. In North Leeds, US 51 has a major junction with Wisconsin Highway 22 (WIS 22) and WIS 60 where US 51 heads west a bit with WIS 60 before splitting back north toward Poynette. The route joins I-39 north of Portage. There is a short concurrency with WIS 23 from Endeavor to WIS 82 near Oxford. They stay joined until I-39 ends at WIS 29. Along the way, the route bypasses the small communities of Endeavor, Packwaukee, Westfield, Coloma, Hancock, Plainfield, Plover, and Whiting prior to arriving at Stevens Point. Proceeding north from Stevens Point, the highway bypasses Knowlton, Mosinee, and Rothschild where I-39 terminates at the WIS 29 east interchange. US 51 continues on with WIS 29 for five miles (8.0 km) bypassing Schofield, then proceeding into Wausau where WIS 29 splits to the west. US 51 continues as a freeway to Merrill, passing Brokaw along the way.


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