SR 9/South Lake Stevens Road – Intersection Improvements - Complete May 2023

This stretch of SR 9 in the city of Lake Stevens is in the heart of a rapidly expanding community. In 2020, about 19,050 vehicles travel through the SR 9/South Lake Stevens Road intersection per day, with seven percent coming from the west on South Lake Stevens Road. These numbers are expected to rise with planned development to the west of the intersection.

This project constructed a roundabout designed to handle high volumes of traffic and improve safety. Before the project, stopped vehicles turning onto SR 9 from South Lake Stevens Road had to merge with through traffic traveling 55 mph. The roundabout was expected to reduce collisions at the intersection by at least 50 percent.

In addition to the roundabout, crews made several improvements to the area including tree planting, re-constructing the Centennial Creek channel to make it useable for salmon, and stormwater treatment with the creation of a new detention pond.

We also replaced the existing fish passage culvert under South Lake Stevens Road with a 19-foot-wide passageway and included stream habitat elements to help promote successful fish and stream function.