Wisconsin State Route 81 runs east-west across Southwestern Rock County. It runs from the Green/Rock County Line, near Brodhead, to the junction with Interstate 39/43/90 at Beloit. WI St Rt 81 passes through the following town in Rock County. Beloit
EB WI St Rt 81 at the Rock/Green County Line. A junction marker on NB U.S. Rt. 51. EB WI St Rt 81 in Beloit. EB WI St Rt 81 east of U.S. Rt. 51 in Beloit. EB WI St Rt 81 on the eastside of Beloit. A BGS on NB I-39/WB I-90. A BGS on NB I-39/90. A junction marker on SB I-43. SB WI St Rt 81 at I-39/43/90. A BGS on SB I-39/EB I-90. A BGS on NB I-39/WB I-90 two miles from I-43. (October, 2024) A BGS on NB I-39/WB I-90 one mile from I-43. (October, 2024) The eastern end marker in Beloit. The eastern end marker in Beloit. (December, 2013)
