It runs in north--south in south central Wisconsin from Madison to Baraboo, The highway uses the Merrimac Ferry, the last ferry in the Wisconsin state highway system, to cross the Wisconsin River at Merrimac.
It runs in north--south in south central Wisconsin from Madison to Baraboo, via Waunakee and Lodi. On this road is the semi-famous Merrimac Ferry, the last ferry in the Wisconsin state highway system, which crosses the Wisconsin River at Merrimac.