Major Traffic Detour on Des Moines Memorial Drive will begin Mon., June 3


The City of SeaTac Public Works Department is working to improve Des Moines Memorial Drive South for residents, freight traffic and commuters by grinding and overlaying new asphalt pavement along the roadway this summer.

The construction project will begin on Monday, June 3 and is estimated to be completed by Friday, Oct. 2, 2019.

During the four-month construction period, crews will be shutting down lanes along Des Moines Memorial Drive South between South 128th Street to South 136th Street. Drivers are advised to find alternate routes around the area as these lane closures will impact drivers who utilize this stretch of roadway.

For a period of 10 days in August, the road will be completely closed. During this time, an alternate route will be provided. Access to local residents and businesses will be maintained at all times during this 10-day closure. Residents and businesses will be notified prior to the complete road closure. All construction timelines are weather-dependent.

King County Metro will be closing bus stops located along the affected route during the duration of the project. Stops #50010 and #49400 will remain open.

Stop / Location (Open):

  • 50010 / Des Moines Memorial Drive & S 128th St
  • 49400 / Des Moines Memorial Drive & S 136th St

Stop / Location (Temporarily Closed during construction):

  • 49430 / Des Moines Memorial Drive & S 128th St
  • 49420  / Des Moines Memorial Drive & S 132nd St
  • 50020 / Des Moines Memorial Drive & S 132nd St
  • 49410 / Des Moines Memorial Drive & S 134th St
  • 50030 / Des Moines Memorial Drive & S 134th St

King County Metro is placing temporary stops near S. 128th Street and S. 136th Street, outside of the construction limits, for customers to use during the project. Visit King County Metro for additional information https://kingcounty.gov/depts/transportation/metro.aspx.

In addition to the new asphalt pavement, the City will be upgrading the roadways with multiple safety improvements for pedestrians. The City will be installing:

  • New curb ramps for wheelchairs and bicyclists
  • New pedestrian signals to make it easier for people to cross the street safely
  • New push-button crosswalk signals at the intersections to meet current Americans with Disability Act (ADA) standards
  • New traffic detection systems at stoplights in order to alert the signal when cars are waiting, which will improve traffic flow

Additionally, crews will be replacing and upgrading the stormwater infrastructure. New catch basins will be installed along with larger replacement stormwater pipes. A stormwater quality treatment vault will be installed within the existing system. These upgrades will improve stormwater flow and limit the amount of flooding along the roadway during heavy rainfall.


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