Located entirely within Wisconsin, the 191.55-mile Interstate 43 connects Beloit to Green Bay via Milwaukee. Initially planned as an extension of Interstate 571, the Green Bay-Milwaukee section of I-43 was completed in 1981, replacing U.S. 141 along a majority of the corridor. In 1987, an additional 72 miles of Interstate 43 was commissioned, extending the freeway along the Rock Freeway (then Wis 15) southwest from Milwaukee to Interstate 90 in Beloit. Within the Milwaukee area, I-43 from Green Bay overlaps with I-41/894 along the Airport Freeway and with I-94 along the North South Freeway.

Interstate 43 Wisconsin Guides

Part of a multi-year project to widen I-39/90 between the Illinois state line and Madison, work began in 2018 to reconstruct the exchange at I-43/Wis 81. Improvements include converting the existing cloverleaf with Wis 81 to a diverging diamond interchange (DDI) and building new connections between I-39/90 and I-43 separate from the DDI. As a result of the modifications, Wis 81 will be extended east to meet I-43 at Exit 2 (Hart Road). Work is expected to be complete by Fall 2021.2

Future DDI at I-39/90 and WIS 81 - Beloit, WI

A diverging diamond interchange (DDI) will replace the existing cloverleaf (Exit 185) between I-39/90 and WIS 81 by Fall 2021.

I-39/43/90 and WIS 81 Interchange Improvements - Beloit, WI

Plans showing improvements to the exchange between I-39/43/90 and WIS 81 near Beloit. Directional ramps between I-39/90 and I-43 will be added as well as converting the cloverleaf interchange with WIS 81 into a DDI.

  1. "Route Approved for I-57." The Milwaukee Journal, May 18, 1973.
  2. I-39/90 Expansion Project - South Segment (Beloit to Janesville), 511 Wisconsin Construction Projects (WisDOT) (projects.511wi.gov).

    Connect with:
    Interstate 39
    Interstate 41 / U.S. 41
    Interstate 90
    U.S. 10
    U.S. 12
    U.S. 141
    U.S. 151

    Page Updated 10-04-2016.

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