Washington State Route 304

State Route 304
Map of western Washington with SR 304 highlighted in red and with its ferry route highlighted in dashed green
Route information
Auxiliary route of SR 3
Maintained by WSDOT
Length	3.14 mi[1] (5.05 km) Mileage does not include ferry route
Existed	1964–present
Major junctions
West end	SR 3 near Bremerton
Major intersections	SR 303 in Bremerton
East end	SR 519 at Colman Dock in Seattle
Location
Country	United States
State	Washington
Counties	Kitsap, King
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 303 → SR 305

State Route 304 (SR 304) is a state highway in Kitsap County, Washington, United States. It connects SR 3, a regional freeway, to the Puget Sound Naval Shipyard and downtown Bremerton. The designation of SR 304 continues onto the Seattle–Bremerton ferry operated by Washington State Ferries to Colman Dock in Downtown Seattle, terminating at SR 519 on Alaskan Way.

The highway was built in the early 20th century, running along Sinclair Inlet and through the town of Charleston before reaching Bremerton. It was added to the state highway system in 1915 as part of the Navy Yard Highway (State Road 21) and was later incorporated into Primary State Highway 21 (PSH 21). A branch of PSH 21 connecting the main highway to the Bremerton ferry terminal was added to the state system in 1961 and was renumbered to SR 304 in 1964.

SR 304 originally terminated on the northwest side of the naval shipyard until SR 3 was relocated onto a bypass of Bremerton in the 1970s, necessitating a southwest extension. The highway was briefly removed from the state system by the state legislature from 1991 to 1993 and was extended over the Seattle–Bremerton in 1994. A major improvement project began in 1998, building a new boulevard to serve SR 304, widening the highway through Bremerton, and adding a short tunnel for westbound traffic from the ferry terminal.