The State Route 410/166th Avenue interchange is a congested mess. Originally built in the early 1970s, this interchange serves regional commuters cutting through Sumner to avoid the SR 167 congestion and thousands of vehicles trying to access busy commercial areas. Beyond the usual congestion found at so many regional interchanges/routes, the issue here is a completely unsafe intersection control situation for drivers, as well as a complete lack of pedestrian facilities and a small, buried culvert that prevents fish from continuing to access habitat in Salmon Creek.
Solutions
- Widen the remaining two-lane stretch of 166th Avenue to eliminate the bottleneck just north of the existing SR410 interchange.
- Design and construct two roundabouts at SR410 Westbound on/off ramp and at 64th Street to reduce congestion and improve safety.
- Replace an existing undersized culvert with a new fish-passage culvert to carry Salmon Creek across the existing intersection at 166th Avenue and 64th Street. Daylight a portion of stream channel to improve salmon habitat.
