Washington State Route 300

State Route 300 (SR 300) is a short state highway in Mason County, in the U.S. state of Washington. It extends 3.35 miles (5.39 km) from Belfair State Park to SR 3 in the community of Belfair. The route serves as a connector from Belfair State Park to Belfair and SR 3. The highway was Secondary State Highway 21C (SSH 21C) from 1957 until 1964.

State Route 300
Map of Mason County in western Washington with SR 300 highlighted in red
Route information
Auxiliary route of SR 3
Defined by RCW 47.17.540
Maintained by WSDOT
Length3.35 mi[1] (5.39 km)
Existed1964[2]–present
Major junctions
West end Belfair State Park
East end SR 3 in Belfair
Location
CountiesMason
Highway system
← SR 292→ SR 302

Route description

SR 300 runs 3.35 miles (5.39 km) from Belfair State Park to SR 3 in the community of Belfair. The route serves as a connector from Belfair State Park to Belfair and SR 3.[3][4] WSDOT has found that more than 11,000 motorists utilize the road daily before the interchange with SR 3 based on average annual daily traffic (AADT) data.[5] SR 300 starts at the entrance to Belfair State Park west of Belfair. From the state park, the highway goes northeast along the coastline of the Hood Canal to Belfair, and turns south to merge onto SR 3.[3][6]

History
The shield of SSH 21C

When the Primary and Secondary Highways were realigned in 1957, the current SR 300 became Secondary State Highway 21C (SSH 21C).[7] SSH 21C became SR 300 in 1964 during the 1964 highway renumbering, in which the Washington State Department of Transportation (WSDOT) replaced the previous system of Primary and Secondary Highways with a new system called State Routes, which is still in use today.[8][9]

Major intersections

The entire route is in Mason County.

Locationmi[1]kmDestinationsNotes
​0.000.00 Belfair State Park
Belfair3.185.12Old Belfair Highway and NE Clifton LaneRoute turns south here (unsigned; signage on SB SR 3 near Clifton Lane is incorrect)
3.355.39 SR 3 – Shelton, Bremerton, Port Gamble
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References
  1. Washington State Department of Transportation. "State Highway Log, 2006" (pdf). Retrieved November 10, 2008.
  2. Washington State Legislature. "RCW 47.17.540: State Route 300". Retrieved November 10, 2008.
  3. Google (November 20, 2015). "State Route 300 Map" (Map). Google Maps. Google. Retrieved November 20, 2015.
  4. The Road Atlas (Map). Rand McNally. 2008. p. 108. ISBN 0-528-93961-0.
  5. Washington State Department of Transportation (2007). "Washington Annual Average Daily Traffic Data" (PDF). Retrieved November 10, 2008.
  6. Official State Highway Map (PDF) (Map) (2008-2009 ed.). 1:842,000. Official State Highway Maps. Cartography by U.S. Geological Survey. Olympia, Washington: Washington State Department of Transportation. 2008. § E3. Retrieved November 10, 2008.
  7. Washington State Legislature (1957). "172". Session Laws of the State of Washington. Session Laws of the State of Washington (1957 ed.). Olympia, Washington: Washington State Legislature. Retrieved November 10, 2008.
  8. C. G. Prahl, Washington State Highway Commission (December 1, 1965). "Identification of State Highways, Part 1" (PDF).
  9. C. G. Prahl, Washington State Highway Commission (December 1, 1965). "Identification of State Highways, Part 2" (PDF).
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