166th Avenue E/SR 410 Interchange


The Challenge

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.




The Challenge

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.



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  • Is there not a simpler option?

    by BM, about 2 months ago

    I'm rather surprised that the city is considering implementing such a complex double roundabout at this location. It seems like there are better alternatives available. For instance, there is plenty of vacant land that could be acquired to relocate the on and off ramps for SR410 westbound. Alternatively, a simpler option would be to utilize the dead end for 64th St E as the off-ramp for westbound 410, as the alignment there is perfect for such a purpose. Of course, this would inevitably affect the Corliss entrance, but perhaps there's a way to accommodate both?

Page last updated: 20 Mar 2024, 10:35 AM