U.S. Federal Route 18 is a one of the main east-west highways across Grant County. It runs along the northern portion of the county. U.S. Rt. 18 passes through the following towns in Grant County. Mount Hope Mount Ida Fennimore Montfort U.S. Rt. 18 is multi-plexed in Grant County. Wisconsin State Route 35, from the Grant/Crawford County Line to near Patch Grove. Wisconsin State Route 133, from near Patch Grove to near Mount Hope.