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Planning for detours

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

A map showing SE Sedgwick Road from just west of Jackson Avenue SE to east of Lakeview Drive SE, with Salmonberry Creek flowing through the middle of the map from the top of the image to the bottom. An orange line represents a temporary road built off the main road to the north of SE Sedgwick Road, from Long Lake Drive SE to just west of Phillips Road SE. A green shaded area along Salmonberry Creek extends through the middle of the map and shows the sensitive wetlands along the creek.
WSDOT considered building a temporary one-way road to move traffic around the work zone.

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

A map showing SE Sedgwick Road from just west of Jackson Avenue SE to east of Lakeview Drive SE, with Salmonberry Creek flowing through the middle of the map from the top of the image to the bottom. A green shaded area along Salmonberry Creek extends through the middle of the map and shows the sensitive wetlands along the creek. Red bars on SE Sedgwick Road from Long Lake Road SE to Blackberry Hills Lane SE represent the closed road.  A signed detour route from Long Lake Road SE to Salmonberry Road SE to Jackson Avenue SE is indicated with arrows.
Vehicle traffic will use existing roads to detour around the work zone during a six-week 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.

At the top of the image there are four lines of green cars, with six cars in three lines and eight cars in the bottom line. This is used to represent the length of time traffic would be impacted by the alternating one-way traffic alternative. Each car represents one week of disruption for a total of at least 26 weeks. At the bottom of the image, a line of six green cars is used to represent the length of time traffic would be affected by a total road closure. Each car represents one week of disruption for a total of at least 6 weeks. It is also noted that these estimates do not include some flagger-controlled alternating one-way traffic before and after culvert construction.
The alternating one-way traffic alternative will affect traffic for about four times
as long as the total road closure option.
A bar graph shows a green square representing the amount of wetlands affected by the alternating one-way traffic option, with “23,000 sq ft” inside of it. Next to it is a smaller, lighter green rectangle representing the amount of sensitive wetland habitat affected by the total closure option, with “5,700 sq ft” inside the square. The graph shows that the alternating one-way traffic option affects 3.5 times as much sensitive wetlands than the total closure option.
The alternating one-way traffic alternative affects more than three times as much
sensitive wetland habitat as the total closure option.

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.

A map showing the closure area and the detour route. Traffic will use a two-way detour route along Jackson Avenue SE, SE Salmonberry Road, and Long Lake Road SE during a six-week closure of SE Sedgwick Road. Crews will maintain local access between Jackson Avenue SE and Blackberry Hill Lane SE.
Vehicle traffic will use existing roads to detour around the work zone during
a six-week closure of SE Sedgwick Road.

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.

People walking or rolling will use a two-way detour route along Phillips Road SE, SE Salmonberry Road and Lakeview Drive SE during a six-week closure of SE Sedgwick Road. Crews will maintain local access between Jackson Avenue SE and Blackberry Hill Lane SE.
People walking or rolling will use existing roads to detour around the work zone during
a six-week closure of SE Sedgwick Road.

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.

A map of the project area shows the full closure of SE Sedgwick Road between Phillips Road SE and Long Lake Road SE. Alternate routes are available throughout the area.
The six-week closure of section of SE Sedgwick Road is planned for summer 2024.

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.