State highway in Kitsap County, Washington, US
State Route 310 (SR 310) is a 1.84-mile-long (2.96 km) state highway in the U.S. state of Washington, serving the city of Bremerton in Kitsap County. The highway travels east within Bremerton from an interchange with SR 3 to an intersection with SR 304 as Kitsap Way and Callow Avenue. SR 310 was established in 1991, following the former alignment of SR 3 on city streets in Bremerton before the construction of its current freeway in the 1960s and 1970s. The highway was codified in 1915 as State Road 21 in 1915 and Primary State Highway 21 (PSH 21) in 1937 before becoming SR 3 during the 1964 highway renumbering.