Map of Mason County in western Washington with SR 300 highlighted in red
Route information
Auxiliary route of SR 3
Maintained by WSDOT
Length
3.35 mi[1] (5.39 km)
Existed
1964[2]–present
Major junctions
West end
Belfair State Park
East end
SR 3 in Belfair
Location
Country
United States
State
Washington
Counties
Mason
Highway system
State highways in Washington
Interstate
US
State
Scenic
Pre-1964
1964 renumbering
Former
← SR 292
→ SR 302
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.
^Washington State Department of Transportation. "State Highway Log, 2006" (PDF). Retrieved November 10, 2008.
^Washington State Legislature. "RCW 47.17.540: State Route 300". Retrieved November 10, 2008.
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