State Trunk Highway 61 (often called Highway 61, STH-61 or WIS 61) was a number assigned to a state highway in the U.S. state of Wisconsin. It traveled roughly along:
the pre-Interstate alignment of Wisconsin Highway 15 (WIS 15) from Beloit to Milwaukee (now part of CTH-X, WIS 11, WIS 67, US 12, CTH-ES, and National Avenue). WIS 61 had always follow at least a portion of what later became WIS 15.[1][2][5] WIS 15 had plenty of alterations before being superseded by I-43 in 1988.[6]
^ abWisconsin Highway Commission (1934). Official Highway Map of Wisconsin(PDF) (Map). 1:887,040. Madison: Wisconsin Highway Commission. Retrieved February 5, 2023 – via Wikimedia Commons.
^Wisconsin Department of Transportation Division of Highways (1989). Wisconsin Highway Map(PDF) (Map) (1989–1990 ed.). 1:823,680. Madison: Wisconsin Department of Transportation. Retrieved February 5, 2023.