WIS 120 started showing up on state maps as early as 1937, however it ended in WIS 50 in downtown Lake Geneva. Around 1987-1988, WIS 120 and CTH-H were routed around downtown using their present routes, WIS 50, and US 12. WIS 120 continued straight past the current turn-off via Pilgrim Church Road, Lake Shore Drive, Baker Street, Wrigley Drive, and Broad Street.
WIS 120 was first shown on state maps in 1937 but ended up in WIS 50 downtown Lake Geneva. Around 1987-1988, WIS 120 and CTH-H were rerouted around the downtown area using their current routes (WIS 50, US 12).  WIS 120 continued straight past the current exit on Pilgrim Church Road, Lake Shore Drive, Baker Street, Wrigley Drive, and Broad Street.