According to bestitude, US 51 is a US Highway in the US state of Wisconsin. The road forms a north-south route through the center of the state, from the Illinois border at Beloit through Madison and Wausau to Hurley. US 51 is 509 kilometers long in Wisconsin.
The northern terminus of US 51 at Hurley.
US 51 in Illinois comes from Rockford and then parallels Interstate 90 in Wisconsin to Portage. In addition, US 51 passes through the east of the state capital Madison but is only important for urban traffic, it is not a significant access road like other US Highways around Madison. From Portage to Merrill, US 51 follows Interstate 39. After that, the route is a divided highway, after which the bypass of Tomahawk is again a short freeway. Further north, US 51 is single-lane and leads through wooded area with many lakes before ending at US 2 at Hurley.
According to biotionary, US 51 was created in 1926 and always ended on US 2 in Hurley, it was one of the primary north-south routes at the time. The route was developed as a freeway between Portage and Merrill between the 1970s and 1990s and was renumbered I-39 in the 1990s, making US 51 the secondary number here.
In 2021, the grade-separated connection with US 2 at the northern terminus in Hurley will be replaced by a roundabout.