U.S. Federal Route 18 runs east-west across Central Iowa County. It runs along an expressway from the Dane/Iowa County Line, near Blue Mound, to Dodgeville. From Dodgeville, west to the Iowa/Grant County Line, at Montfort, it runs along a surface highway. U.S. Rt. 18 passes through the following towns in Iowa County. Barneveld
Ridgeway
Dodgeville
Edmund Cobb Montfort U.S. Rt. 18 is multi-plexed in Iowa County. U.S. Rt. 151, from the Dane/Iowa County Line, to Dodgeville.
A junction marker on WB ICH ID. WB U.S. Rt. 18/SB U.S. Rt. 151 west of Barneveld. WB U.S. Rt. 18/SB U.S. Rt. 151 west of ICH ID. WB U.S. Rt. 18/SB U.S. Rt. 151 east of ICH HHH. WB U.S. Rt. 18/SB U.S. Rt. 151 at ICH HHH. WB U.S. Rt. 18/SB U.S. Rt. 151 west of ICH HHH. WB U.S. Rt. 18/SB U.S. Rt. 151 east of ICH BB. WB U.S. Rt. 18/SB U.S. Rt. 151 west of ICH BB. WB U.S. Rt. 18/SB U.S. Rt. 151 east of ICH Y/YZ. WB U.S. Rt. 18/SB U.S. Rt. 151 west of ICH Y/YZ. WB U.S. Rt. 18/SB U.S. Rt. 151 near ICH Z. A BGS on WB U.S. Rt. 18/SB U.S. Rt. 151. WB U.S. Rt. 18/SB U.S. Rt. 151 at south U.S. Rt. 151. EB U.S. Rt. 18; SB ALT/TK WI St Rt 23 east of WI St Rt 23. WB U.S. Rt. 18; NB ALT/TK WI St Rt 23 at WI St Rt 23. A junction marker on NB WI St Rt 23. A set of guide markers on NB WI St Rt 23.