Interstate 39 is a north–south Interstate Highway in Illinois and Wisconsin that runs from an interchange at I-55 in Normal, Illinois, to State Trunk Highway 29 approximately six miles south of Wausau
Aerial view of I-39 as it passes Minonk, Illinois, April 2012
I-39/US 51 in northern Wisconsin
Northern terminus of I-39 at the interchange with WIS 29 near Wausau
U.S. Route 51 or U.S. Highway 51 is a major south–north United States highway that extends 1,277 miles from the western suburbs of New Orleans, Louisiana, to within 150 feet of the Wisconsin–Michigan
Interstate 39
…Wisconsin, I-39 has a length of 182 miles (293 km). Among the newest Interstate Highways in Illinois, I-39 was completed in 1992. Designed to replace U.S. Route 51 (US 51) with an Interstate-grade freeway, the highway runs concurrently with US 20 in Rockford before joining I-90. From Rockford to Portage, Wisconsin…
Southern terminus of US 51 at US 61, LaPlace
US 51 between Mounds and Cairo, during the Great Mississippi Flood of 1927
Northern terminus of US 51 at US 2 in Hurley, Wisconsin