State Route 508 (SR 508) is a 32.84-mile (52.85 km) long state highway located in Lewis County within the U.S. state of Washington, extending from an interchange with Interstate 5 (I-5) concurrent with U.S. Route 12 (US 12) in Napavine to SR 7 in Morton. By 1916, a road between Napavine and Cinebar was constructed on the current route of SR 508 and was signed in 1937 as Secondary State Highway 5K (SSH 5K) after being extended to Morton. SSH 5K became SR 508 in 1968 and since then, a segment in Bear Canyon has been reconstructed twice between 2007 and 2009 and a bridge over the Tilton River was reconstructed in 2009.
^Washington State Department of Transportation (2008). "State Highway Log: Planning Report, SR 2 to SR 971" (PDF). Retrieved July 18, 2009.
^Washington State Legislature (1970). "RCW 47.17.675: State route No. 508". Retrieved July 18, 2009.
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