.svg) U.S. Route 151 | ||||||||||
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 US 151 highlighted in red | ||||||||||
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| Auxiliary route of US 51 | ||||||||||
| Length | 324 mi[1] (521 km) | |||||||||
| Existed | 1926–present | |||||||||
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| South end |  I-80 near Williamsburg, IA | |||||||||
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| North end |   I-43 / WIS 42 in Manitowoc, WI | |||||||||
| Location | ||||||||||
| Country | United States | |||||||||
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U.S. Highway 151 (US 151) is a United States Numbered Highway that runs through the states of Iowa and Wisconsin. The southern terminus for US 151 is at a junction with Interstate 80 (I-80) in Iowa County, Iowa, and its northern terminus is at Manitowoc, Wisconsin. The route, from south to north follows a northeasterly path through the two states.
US 151 is an important corridor which connects Cedar Rapids, Iowa to Fond du Lac, Wisconsin with an expressway (except for a segment about ten miles where it uses arterial roads instead in Madison, Wisconsin).
Approximately seven miles (11 km) south of Dubuque, Iowa, US 151 joins with US 61. The two highways share a route from there to Dickeyville, Wisconsin. Five miles (8.0 km) south of Dubuque, US 61/US 151 joins with US 52 and shares a route with US 52 until it veers south in Key West.
In Wisconsin, US 61/US 151 joins with Wisconsin Highway 35 (WIS 35) about one mile (1.6 km) north of the Iowa–Wisconsin border. At Dickeyville, US 151 splits off and heads northeast to Platteville. US 61/WIS 35 continues north. US 151 later joins with US 18 near Dodgeville. The two highways share a route all the way to Madison.