Washington State Route 308

State Route 308 (SR 308) is a 3.42-mile-long (5.50 km) state highway in the U.S. state of Washington, serving the community of Keyport in Kitsap County. The highway travels generally east from an interchange with SR 3 east of Naval Base Kitsap at Bangor to the main entrance of the Naval Undersea Warfare Center in Keyport. SR 308 was codified as the Keyport branch of State Road 21 in 1929 and continued as the Keyport branch of Primary State Highway 21 (PSH 21) in 1937. During the 1964 highway renumbering, the branch became a section of SR 303, which ran from Bremerton to Bangor and had a spur route serving Keyport. SR 308 was established in 1971 along the old route of SR 303 Spur and was extended in 1991 to the SR 3 freeway after SR 303 was re-routed onto a new freeway in Silverdale.

State Route 308
SR 308 is highlighted in red.
Route information
Auxiliary route of SR 3
Defined by RCW 47.17.567
Maintained by WSDOT
Length3.42 mi[1] (5.50 km)
Existed1971[2]–present
Major junctions
West end SR 3 in Bangor
East endNaval Undersea Warfare Center in Keyport
Location
CountiesKitsap
Highway system
← SR 307SR 310 →

Route description
SR 3 northbound at its interchange with SR 308 in Bangor

SR 308 begins as Luoto Road at a diamond interchange with SR 3 east of Naval Base Kitsap at Bangor.[3] The highway travels east through wooded land, intersecting several minor roads until the roadway turns northeast and crosses over Liberty Bay into the unincorporated community of Keyport.[4][5] Within Keyport, SR 308 passes the Naval Undersea Museum and serves as the main thoroughfare through the community before it ends at the main entrance to the Naval Undersea Warfare Center, continuing east as Strom Avenue into the base.[6][7][8]

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 the busiest section of the highway was between SR 3 and Liberty Bay, serving 11,000 vehicles, while the least busy section was the bridge over Liberty Bay, serving 6,300 vehicles.[9]

History

The current route of SR 308 was first added to the state highway system in 1929 as the Keyport branch of State Road 21 and was carried over to the primary and secondary state highway system in 1937 as a branch of PSH 21.[10][11] The branch traveled 2.34 miles (3.77 km) east from PSH 21 near Naval Submarine Base Bangor to the Naval Undersea Warfare Center in Keyport, intersecting Secondary State Highway 21B (SSH 21B) before crossing Liberty Bay.[12][13] The Keyport branch was incorporated into SR 303, which replaced SSH 21B,[14][15] with a short spur route serving Keyport.[16] SR 308 was established in 1971 to replace the Keyport spur of SR 303 and extended over SR 303 in 1991 to SR 3 after SR 303 was moved south to end in Silverdale.[2][17][18]

Major intersections

The entire highway is in Kitsap County.

Locationmi[1]kmDestinationsNotes
Bangor0.00–
0.09		0.00–
0.14		 SR 3 – Bremerton, PoulsboWestern terminus, interchange
Keyport3.425.50Naval Undersea Warfare Center entranceEastern terminus, continues as Strom Avenue
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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References
  1. Staff (2012), State Highway Log: Planning Report 2012, SR 2 to SR 971 (PDF), Washington State Department of Transportation, pp. 1373–1374, retrieved February 17, 2013
  2. "47.17.567: State route No. 308", Revised Code of Washington, Washington State Legislature, 1987 [1971], retrieved February 17, 2013
  3. SR 3: Junction SR 308/Luoto Road (PDF), Washington State Department of Transportation, February 26, 2009, retrieved February 17, 2013
  4. "Feature Detail Report for: Liberty Bay", Geographic Names Information System, United States Geological Survey, September 10, 1979, retrieved February 17, 2013
  5. "Feature Detail Report for: Keyport", Geographic Names Information System, United States Geological Survey, September 10, 1979, retrieved February 17, 2013
  6. "Feature Detail Report for: Naval Undersea Museum", Geographic Names Information System, United States Geological Survey, June 7, 2010, retrieved February 17, 2013
  7. "Feature Detail Report for: Naval Undersea Warfare Center", Geographic Names Information System, United States Geological Survey, November 17, 2008, retrieved February 17, 2013
  8. Google (November 15, 2010). "State Route 308" (Map). Google Maps. Google. Retrieved November 15, 2010.
  9. Staff (2011), 2011 Annual Traffic Report (PDF), Washington State Department of Transportation, p. 173, retrieved February 17, 2013
  10. Washington State Legislature (March 14, 1929), "Chapter 116: Primary State Highway No. 21 to Keyport", Session Laws of the State of Washington, Session Laws of the State of Washington (1929 ed.), Olympia, Washington: Washington State Legislature, p. 248, retrieved February 17, 2013, That state road No. 21 be and is hereby established as a primary state highway, and the same is extended by branch from junction therewith, by the most feasible route, to Keyport, in Kitsap county, Washington.
  11. Washington State Legislature (March 17, 1937), "Chapter 185: Establishment of Primary State Highways", Session Laws of the State of Washington, Session Laws of the State of Washington (1937 ed.), Olympia, Washington: Washington State Legislature, pp. 941–942, retrieved February 17, 2013, A primary state highway to be known as Primary State Highway No. 21, or the Kitsap Peninsula Highway, is hereby established according to description as follows: Also beginning at Keyport, thence in a westerly direction by the most feasible route to a junction with Primary State Highway No. 21, as herein described.
  12. Staff (1960), Annual Traffic Report 1960 (PDF), Washington State Highway Commission, Department of Highways, pp. 139–140, retrieved February 17, 2013
  13. Seattle, 1958 (JPG) (Map). 1:250,000. United States Geological Survey. 1958. Retrieved February 17, 2013.
  14. Prahl, C. G. (December 1, 1965), Identification of State Highways (PDF), Washington State Highway Commission, Department of Highways, retrieved February 17, 2013
  15. Seattle, 1965 (JPG) (Map). 1:250,000. United States Geological Survey. 1965. Retrieved February 17, 2013.
  16. Staff (1970), Annual Traffic Report 1970 (PDF), Washington State Highway Commission, Department of Highways, p. 169, retrieved February 17, 2013
  17. Staff (1991), 1991 Annual Traffic Report (PDF), Washington State Department of Transportation, p. 129, retrieved February 17, 2013
  18. Friedrich, Ed (December 29, 2012), "35 years ago, Trident subs changed face of Kitsap", Kitsap Sun, retrieved February 17, 2013

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