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I-43

Interstate 43 marker

Interstate 43
Route information
Maintained by WisDOT
Length: 191.55 mi (308.27 km)
Existed: 1981 – present
Tourist
routes:
Lake Michigan Circle Tour
Major junctions
South end: I-39 / I-90 / WIS 81 in Beloit
 
North end: I-41 / US 41 / US 141 in Howard
Location
Counties: Rock, Walworth, Waukesha, Milwaukee, Ozaukee, Sheboygan, Manitowoc, Brown
Highway system
WIS 42 WIS 44

Alternate Interstate 43
Location: Sheboyan, Ozaukee, and Milwaukee counties

Interstate 43 marker

Interstate 43 (I-43) is a 191.55-mile-long (308.27 km) Interstate Highway located entirely within the U.S. state of Wisconsin, connecting I-39/I-90 in Beloit with Milwaukee and I-41, U.S. Highway 41 (US 41) and US 141 in Green Bay. Wisconsin Highway 32 (WIS 32) runs concurrently with I-43 in two sections and US 41, US 45, I-94, I-894, US 10, WIS 57, and WIS 42 overlap I-43 once each. There are no auxiliary or business routes connected to I-43; however, as of late 2015 there is a signed alternate route in Milwaukee County.

I-43 came about as a result of toll road proposals that included a Milwaukee to Superior corridor that included Hurley, Wausau and Green Bay. Only the Milwaukee-to-Green Bay section was approved. The route was originally planned to follow an alignment about midway between US 41 and US 141 (the latter paralleled Lake Michigan at the time) along WIS 57. Controversy about this location and use of right-of-way led to the establishment of the current alignment, which follows much of what was the 1950s-era realignment of US 141 from Milwaukee to Sheboygan, and a new alignment from Sheboygan to Green Bay. This section was completed in 1981.


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