Washington State Route 310
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SR 310 is highlighted in red.
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| Route information | ||||
| Auxiliary route of SR 3 | ||||
| Defined by RCW 47.17.569 | ||||
| Maintained by WSDOT | ||||
| Length: | 1.84 mi (2.96 km) | |||
| Existed: | 1991 – present | |||
| Major junctions | ||||
| West end: |
 SR 3 in Bremerton
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| East end: |
 SR 304 in Bremerton |
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| Location | ||||
| Counties: | Kitsap | |||
| Highway system | ||||
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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.
SR 310 begins at a diamond interchange with the SR 3 in Bremerton and travels east as Kitsap Way, passing south of Oyster Bay. The highway briefly travels northeast, passing Forest Ridge Park, before turning southward onto 6th Street and Callow Avenue, ending at an intersection with SR 304 as it turns east onto Burwell Street.
Every year, the Washington State Department of Transportation (WSDOT) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of average annual daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2011, WSDOT calculated that between 8,100 and 38,000 vehicles per day used the highway. SR 310 is designated as part of the National Highway System, a system of roads that are important to the nation's economy, defense and mobility. WSDOT has also designated SR 310 as a Highway of Statewide Significance, which is critical to connecting major communities in the state.
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