page_title: Washington State Route 508
section_title: Route description
hierarchical_section_title: Washington State Route 508 / Route description
caption_attribution_description: English: Main Avenue from the intersection at 3rd Street, Morton, Washington, U.S.
context_page_description: State Route 508 is a 32.84-mile long state highway located in Lewis County within the U.S. state of Washington, extending from an interchange with Interstate 5 concurrent with U.S. Route 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 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.
context_section_description: SR 508 begins at a diamond interchange with Interstate 5 (I-5) concurrent with U.S. Route 12 (US 12) within Napavine city limits. From the interchange, the highway leaves Napavine and travels southeast through an intersection with the Jackson Highway, formerly US 99, to bridge and parallel the South Fork of the Newaukum River, passing Onalaska and Alpha before unparalleling the river and continuing east to Cinebar. East of Cinebar, the roadway starts to parallel the Tilton River through Bear Canyon to Morton, where the road becomes Main Avenue and ends at SR 7, named Second Street. An estimated daily average of 5,000 motorists used the I-5 / US 12 / SR 508 interchange in 2007, making it the busiest section of the highway; the SR 7 intersection was the busiest section in 1970, with an estimated daily average of 3,200 motorists.
caption: SR 508 eastbound as Main Avenue in Morton near the SR 7 intersection.
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