Exceeding Client/Owner Needs
National finalist
Gold Award

David Evans and Associates

Project: Wine Country Roundabouts
Client: City of Woodinville

Photo courtesy of David Evans and Associates
David Evans and Associates designed a series of roundabouts for a corridor in Woodinville’s wine district.

The David Evans and Associates roundabout team created a multi-roundabout corridor in a section of Woodinville dedicated to promoting the wine industry. The design solved the high-speed entry and intersection skew challenges in the area, and allowed a local developer to move forward with a project advantageous to the city.

Originally, a failing traffic signal created congestion and safety problems in the city’s wine-focused tourist district.

The intersection’s problems also frustrated residents and business owners and hampered planned growth.

Replacing the traffic signal with a roundabout had been considered. The Washington State Department of Transportation favored a roundabout, but the original design was too large and took too much property from adjacent property owners.

The DEA design included smaller roundabouts that would act as slowing devices for traffic before entering the larger, two-lane roundabout. The slower approach vehicle speeds would allow the main roundabout to be of a small diameter, permitting less property to be taken. The design also provided additional access to support a mixed-use development.

This solution had a bonus: Under city code the developer was required to construct frontage improvements. Since the developer also controlled a significant amount of the right-of-way required for the roundabouts, the city was able to use the developer’s required frontage improvements as a match to a complementary state grant to fund the project cost.

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