Wisconsin Highway 81

State Trunk Highway 81 (often called Highway 81, STH 81 or WIS 81) is a state highway in the U.S. state of Wisconsin. It runs east–west in southwest and south central Wisconsin from Beloit to Cassville. Between Brodhead and Monroe it shares it route with WIS 11 for 13 miles (21 km).

State Trunk Highway 81 marker

State Trunk Highway 81
Route information
Maintained by WisDOT
Length123.81 mi[1] (199.25 km)
Major junctions
West end WIS 133 in Cassville
  US 61 / WIS 35 in Lancaster
US 151 in Platteville
US 51 in Beloit
East end I-39 / I-43 / I-90 in Beloit
CountiesGrant, Lafayette, Green, Rock
Highway system
WIS 80WIS 82


  1. ^ Bessert, Chris. "Wisconsin Highways: Highways 80-89 (Highway 81)". Wisconsin Highways. Retrieved 2007-03-20.