Washington State Route 203

State Route 203 (SR 203) is a Washington state highway in King and Snohomish counties. The route begins at an intersection with in Fall City. The highway extends north past Carnation and Duvall to end at (US 2) in Monroe. The roadway connects Fall City, Carnation, Duvall and Monroe, all located along the Snoqualmie River, which SR 203 roughly parallels.

The route originally was divided into four separate roads, Fall City–Carnation, Carnation–Duvall, Duvall–Monroe and Lewis Street. The first road to be paved, Lewis Street in Monroe, was completed in 1912; the roads were later combined to form (SSH 15B) in 1937. SSH 15B was later renumbered to SR 203 in 1964 during the highway renumbering. Two corridor improvement projects for the King and Snohomish county portions of the road are currently in the design stage and will start in 2010.

Route description

State Route 203 (SR 203) begins its of highway at an interesction with , a primarily west–east route, in Fall City. There, the road is named the Fall City–Carnation Road and travels northwest, paralleling the former route of the Monroe–Tanner route operated by the Chicago, Milwaukee, St. Paul and Pacific Railroad. After bridging the Rutherford Slough twice, the route travels closer to the shoreline of...
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