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.

Quick Facts State Route 304, Route information ...

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

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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.

SR 304 begins at a partial interchange with SR 3 in the community of Navy Yard City, southwest of downtown Bremerton. The interchange, adjacent to a wastewater treatment plant, lacks a ramp from southbound SR 3 to SR 304, but provides access in the remaining three directions.^[2] The five-lane highway (including a westbound high-occupancy vehicle lane during peak hours)^[1][3] carrying SR 304 travels northeast on Charleston Boulevard along a section of the Puget Sound and Pacific Railroad (owned by the U.S. Navy) and the shore of the Sinclair Inlet.^[4] It enters Bremerton and turns north to follow the western boundary of the Puget Sound Naval Shipyard and the Bremerton Annex of Naval Base Kitsap.^[5] SR 304 passes a Kitsap Transit busyard before shifting east onto North Callow Avenue and intersecting SR 310, which travels west on Kitsap Way to an interchange with SR 3.^[6][7]

From its junction with SR 310, the highway turns east onto Burwell Street and continues through a residential neighborhood on the north side of the naval base. SR 304 then intersects SR 303 at Warren Avenue and enters downtown Bremerton, where it forms the northern and eastern boundary of the naval shipyard. At Park Avenue, the highway passes over a pedestrian tunnel connecting to the shipyard and splits into a couplet:^[8] the eastbound lanes turn onto Pacific Avenue and continue into the Bremerton ferry terminal, while westbound traffic departing from the ferry terminal use a 959-foot (292 m) tunnel.^[9][10] The ferry terminal, at the south end of downtown near the Puget Sound Navy Museum, is divided into two levels with a passenger waiting area and bus bays atop the vehicle holding area.^[7][11]

Under state code, SR 304 continues onto the Seattle–Bremerton ferry operated by Washington State Ferries, a 14-nautical-mile (16 mi; 26 km) route that takes approximately 60 minutes.^[12][13] The corridor is also served by Kitsap Fast Ferries, a passenger ferry operated by Kitsap Transit,^[14] and terminates at Colman Dock in Downtown Seattle, which is also served by a state ferry to Bainbridge Island carrying SR 305 as well as several passenger ferries.^[15][16] SR 304 and SR 305 continue through the Seattle terminal and formally terminate at an intersection with SR 519 on Alaskan Way.^[5][12]

The entire highway is as part of the National Highway System, a national network of roads identified as important to the national economy, defense, and mobility;^[17] it is also listed as part of the Strategic Highway Network by the U.S. Department of Defense.^[18][19] The Washington state government has also designated it as a Highway of Statewide Significance.^[20] SR 304 is maintained by the Washington State Department of Transportation (WSDOT), which conducts an annual survey on state highways to measure traffic volume in terms of annual average daily traffic. Average traffic volumes on the highway in 2016 ranged from a minimum of 1,100 vehicles at the Bremerton ferry terminal to a maximum of 30,000 vehicles at the SR 3 interchange.^[21] The Seattle–Bremerton route operated by Washington State Ferries carried 2.46 million total passengers in 2019, including over 650,000 vehicles.^[22]

The Puget Sound Naval Shipyard was established by the U.S. Navy in September 1891 near the future townsite of Bremerton, which was platted three months later.^[23] The western side of Bremerton and neighboring Charleston were served at the turn of the 20th century by Washington Boulevard, which continued southwest along Sinclair Inlet to Gorst as an unpaved road.^[24] In 1915, local businessmen lobbied for the construction of the Navy Yard Highway to connect Bremerton with the Olympic Highway in Union, Poulsbo, and Kingston.^[25] The state legislature added the corridor to the state highway system that year as State Road 21 and appropriated funds to survey the route.^[26][27]

The state legislature appropriated additional funds to design and construct State Road 21 in its 1917 and 1919 sessions,^[28] while the Union–Charleston was incorporated into the system as the Navy Yard Highway.^[29][30] The two highways were among the first in Washington to receive federal funding under the Federal Aid Road Act of 1916.^[31] Construction on the section through Charleston and western Bremerton began in late 1917 and the entire Navy Yard Highway was dedicated on June 12, 1923.^[32][33]

The Navy Yard Highway was re-designated as State Road 14 and extended through Charleston in 1923, replacing a section of State Road 21, which remained a secondary state highway.^[34] State Road 21 was elevated to primary state highway status in 1929 and was re-designated as Primary State Highway 21 (PSH 21) during a 1937 restructuring of the highway system.^[35][36] A branch of PSH 21, connecting the main highway at Charleston to the Bremerton ferry terminal was added to the state highway system in 1961.^[37] The state ferry system was established in 1951 by acquiring the domestic operations of the Puget Sound Navigation Company, which included the Seattle–Bremerton ferry, notably served by the MV Kalakala (built in 1935).^[38][39]

PSH 21 was replaced by SR 3 in the 1964 state highway renumbering, while the Bremerton branch became SR 304.^[40] Following the construction of the Bremerton freeway bypass for SR 3 in the early 1970s, SR 304 was extended southwest through Charleston and Navy Yard City to its modern terminus.^[41][42] The junction with SR 3 was originally a signalized intersection until it was converted into an interchange in 1991 with the construction of a southbound flyover ramp.^[43] The ramp was initially two lanes wide, but was reduced to a single lane in 1997 to improve merging for traffic on SR 3.^[44]

The highway was initially routed through downtown Bremerton on 6th Street, but was later realigned onto Burwell Street in the 1980s.^[45] In 1991, the state legislature inadvertently removed SR 304 from the state highway system; SR 306 had been intended to be removed and transferred to Kitsap County. WSDOT continued to maintain SR 304 and it was re-added to the state highway system in 1993.^[46] The Seattle–Bremerton ferry was added to SR 304 the following year as part of the incorporation of the ferry system into existing state highways by the legislature.^[47][48]