Tunnel Vision: Elroy-Sparta Trail- and More is a 15.9 mile loop trail located near Wilton, Wisconsin. The trail is primarily used for road biking and is accessible from March until November.
I walked this, and the 400 state trail and more, camping along the way, on a 200 mile walk when I turned 50 in 2005. Met some very nice bicyclists who were doing a large group cross country trip, with a big truck hauling their gear. The tunnels down the road were cool. Small town cafes and taverns yielded some good sandwiches. Nice bike trail, even though I walked/backpacked it.