New roundabout coming to SR 203 this summer will improve safety, mobility between Monroe, Duvall

Majority of construction to occur during four-day, continuous closure of SR 203 near High Rock Road/203rd Street Southeast intersection

HIGH ROCK – Construction will begin in late May on a unique, exclamation point-shaped compact roundabout that will improve mobility and safety along State Route 203/Duvall-Monroe Road Northeast in the High Rock community. The new roundabout will be built at the intersection of SR 203, High Rock Road and 203rd Street Southeast.

Contractor crews working for the Washington State Department of Transportation will complete most of the roundabout construction during a four-day, continuous closure of SR 203 over an extended weekend, tentatively scheduled for late June. Weather could delay the schedule.

Northbound and southbound vehicle traffic will detour around the SR 203 closure using Northeast Woodinville-Duvall Road, West Snoqualmie Valley Road Northeast/High Bridge Road and Crescent Lake Road/Tualco Road. Freight traffic will use Northeast Woodinville-Duvall Road and SR 522 between Duvall and Monroe. Local access will be allowed for people living in the area.

The remaining work will be completed during nighttime lane and shoulder closures before the $2.8 million project concludes later this summer.

Improving mobility and safety

Nearly 12,000 vehicles travel along SR 203 at High Rock Road every day, which is up 10 percent from 2015. Drivers at the intersection are encountering more traffic traveling at speeds up to 55 mph.

The new roundabout will slow vehicle speeds near the intersection, calm traffic and reduce the number of potential conflict points drivers face, making for easier decisions. It also will include two center islands that large trucks can drive over, making it easier for them to navigate.

Schedule updates will be available on the project webpage, WSDOT’s Travel Center map, the WSDOT mobile app and by signing up for Snohomish County email updates.

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