southern Duvall to replace the unsignalized intersection at Northeast 124th Street in 2004, the first to be built on a rural highway in Western Washington, and received favorable feedback from local residents. WSDOT completed construction of a second roundabout in 2008 at the highway's southern terminus with SR 202 in Fall City, costing $4 million. A 2004 study of potential improvements to SR 203 also suggested the addition of a rumble strip in the road's centerline, along with hard landscaping to force motorists to slow down when entering populated areas. A fish culvert on Loutsis Creek was replaced by a composite arch bridge in 2020, the first of its kind in the state. Major intersections References External links Highways of Washington State 203 Transportation in King County, Washington Transportation in Snohomish County, Washington