Wisconsin Highway 21
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| Route information | ||||
| Maintained by WisDOT | ||||
| Length: | 123.4 mi (198.5 km) | |||
| Major junctions | ||||
| West end: |
   WIS 16 / WIS 27 / WIS 71 in Sparta
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 US 12 in Tomah I-94 in Tomah WIS 13 near Friendship  I-39 / US 51 in Coloma  I-41 / US 41 in Oshkosh
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| East end: |
 US 45 in Oshkosh
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| Location | ||||
| Counties: | Monroe, Juneau, Adams, Waushara, Winnebago | |||
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State Trunk Highway 21 (often called Highway 21, STH 21 or WIS 21) is a state highway in the U.S. state of Wisconsin. It runs east–west across the center of the state between Sparta, Wisconsin and Oshkosh. The route often serves as a direct route for travelers between Appleton and Oshkosh to Tomah, and La Crosse It is a two-lane surface road for nearly all of its length, with the exception of a few urban arterials of four or more lanes. The section of WIS 21 between Fort McCoy and I-94 in Tomah is classified as a "Major STRAHNET Connector." while the route past I-94 is classified as a "Non-Interstate STRAHNET Route"
WIS 21 begins at the intersection of WIS 16, WIS 71 and WIS 27 The route then follows WIS 16 and WIS 71 east for about one half of a mile before turning north off the concurrency. WIS 21 proceeds northeast, following the La Crosse River and passes through Fort McCoy. The route then turns eastward and follows alongside the Tarr and Sparta Creeks, passing through Tunnel City. WIS 21 crosses US 12 and I-94 on the north side of Tomah. The route continues east from there to junction with WIS 173 west of Wyeville and then crosses into Juneau County. WIS 21 passes through the Necedah National Wildlife Refuge during its twelve-mile (19 km) stretch of straight route to Necedah. The highway crosses WIS 80 within Necedah and crosses the Wisconsin River at about 3 miles (4.8 km) east of the village. WIS 21 enters Adams County at the river, just south of Petenwell Lake. WIS 21 junctions with WIS 13 three miles (5 km) north of Friendship. The route also provides indirect access to Roche-a-Cri State Park via WIS 13.
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Wikipedia