State Route 181 (SR-181) was a state highway in the U.S. state of Utah connecting SR-152 in Murray and Holladay north to SR-186 in Salt Lake City at its peak, the former being suburbs of the latter. The route was 6.9 miles (11.10 km) for thirty-eight years before being truncated in 2007 and decommissioned entirely later in the same year.When the route was formed in 1935, it went from U.S. Route 89/U.S.