(Bicycle) in Sparta, Monroe County, WI. WI27 (Black River St.) N. 0.2 miles from jct with I90 exit 25, E. on Avon Rd. 0.3 miles, left on unnamed road 0.2 miles, left on unnamed road 0.1 miles to the tank on the left side of the road. (6-28-09, N43 55.536 W90 49.074) Photo by Mark & Gordie Comstock & Larry Baker.