State Route 3 (SR 3) is a state highway in the U.S. state of Washington, serving the Kitsap Peninsula in Mason and Kitsap counties. The highway begins at U.S. Route 101 (US 101) south of Shelton and travels northeast onto the Kitsap Peninsula through Belfair to Gorst, where it intersects SR 16 and begins its freeway. SR 3 travels west of Bremerton, Silverdale and Poulsbo before it terminates at the eastern end of the Hood Canal Bridge, signed as SR 104. The highway is designated as a Strategic Highway Network (STRAHNET) corridor under the National Highway System as the main thoroughfare connecting both parts of Naval Base Kitsap and is also part of the Highways of Statewide Significance program. SR 3 was established during the 1964 highway renumbering and codified in 1970 as the successor to Secondary State Highway 14 (SSH 14) from Shelton to Belfair, Primary State Highway 14 (PSH 14) from Belfair to Gorst, and PSH 21 from Gorst to the Hood Canal Bridge. PSH 21 was previously part of State Road 21 from 1915 to 1937, while PSH 14 was part of State Road 14 and the Navy Yard Highway from 1919 to 1937. The present SR 3 freeway was opened in 1968 in the Bremerton area and was extended north to Silverdale in 1973, to Bangor in 1981, and to Poulsbo in 1983. Route description SR 3 begins at a diamond interchange with US 101 south of Shelton in unincorporated Mason County on the Olympic Peninsula. The highway travels north into Shelton at the end of Oakland Bay on 1st Street and crosses over a Puget Sound and Pacific Railroad line and Goldsborough Creek. SR 3 turns east on Pine Street and leaves Shelton, traveling northeast along Oakland Bay and a US Navy rail line. The highway continues north along Oakland Bay and Case Inlet past heavily forested areas to Allyn-Grapeview, where it serves as the western terminus of SR 302 at North Mason High School. SR 3 travels towards the southern end of the Hood Canal and intersects the eastern termini of SR 106 and SR 300 in Belfair. The highway continues northeast past Bremerton National Airport towards the community of Gorst in Kitsap County, where it forms the western terminus of SR 16. SR 3 becomes a four-lane divided freeway and travels northeast along the Sinclair Inlet to an interchange with SR 304 in