Managing traffic on SE Sedgwick Road
WSDOT closely examined two alternatives for keeping people moving during this project. Alternative A includes months of alternating one-way traffic on a temporary roadway that has a much larger environmental impact. Alternative B completes the work faster with an around-the-clock, full closure for an estimated six weeks.
Alternative A: About 26 weeks of alternating one-way traffic
WSDOT considered building a temporary one-way road. As seen in the above graphic, travelers would use the temporary road to go around the work zone. Construction of a temporary road would disturb 23,000 square feetof sensitive wetlands.
The temporary road would be alternating one-way traffic around-the-clock, seven days a week. Vehicles traveling both directions would need to take turns to pass through the work zone. Temporary traffic signals would control one-way traffic. In this alternative, crews would need to reduce this section of SE Sedgwick Road to alternating one-way traffic for about 26 weeks.
Alternative B: A six-week total closure of SE Sedgwick Road
In this alternative, WSDOT would fully close SE Sedgwick Road between Blackberry Hill Lane SE and Long Lake Road SE. The closure would be for around six weeks.
Traffic would detour around the work zone using existing roads. This option allows crews complete the project more quickly and helps preserve sensitive wetlands around Salmonberry Creek.
Comparison of alternatives
In the alternating one-way traffic alternative, travelers on SE Sedgwick Road would use an alternating one-way road for about 26 weeks. Over 23,000 square feet of sensitive wetland would be affected by the construction of the temporary one-lane road.
In the total closure alternative, a portion of SE Sedgwick Road would be closed for around six weeks. During this time, travelers would be detoured around the construction site. This option would affect 5,700 square feet of sensitive wetlands during construction.
Our preferred alternative: SE Sedgwick Road closure in summer 2024
After reviewing alternatives and considering all factors, WSDOT determined the six-week full closure of SE Sedgwick Road is the best way to complete the project. It will have the smallest affect on sensitive wetlands and disrupt traffic for the least amount of time. In August and September 2024, crews will close SE Sedgwick Road between Blackberry Hill Lane SE and Long Lake Road SE. Traffic will follow a signed detour route along Jackson Avenue SE, SE Salmonberry Road and Long Lake Road SE. Local access will be available between Jackson Avenue SE and Blackberry Hill Lane SE.
What about bikes and pedestrians?
People walking or rolling through the area will use a signed detour to travel around the closure. The detour route is along Phillips Road SE, SE Salmonberry Road and Lakeview Drive SE.
How will this affect me?
WSDOT will make the closure widely known. We will use electronic road signs, social and traditional media and other WSDOT resources to announce the closure. WSDOT also will ask travelers to use alternate routes or avoid peak travel times if possible. During large scale construction projects, we often see drivers change their travel plans to avoid detours and related traffic.
WSDOT also will work with local law enforcement to monitor travel around the detour route.
To complete the work as quickly as possible, crews will work extended shifts from 7 a.m. to 10 p.m. up to seven days per week, including holidays and weekends. Most work will occur during the day. Any work outside of daytime hours will follow local noise ordinances.
WSDOT will communicate plans for construction early and often. This will let travelers know when the work is scheduled so they can plan for alternate routes or additional travel time.