The City of SeaTac Public Works Department is progressing with the design and construction of stormwater and street enhancements along 16th Ave South, South 192nd Street, and South 188th Street.

The storm portion of this project proposes to replace an open channel drainage system with a piped drainage system to collect surface water runoff from the west half of 16th Avenue South. The project will also redirect surface water runoff from a portion of South 188th Street to the new piped drainage system on 16th Avenue South. This project will install new storm drainpipes, catch basins, manholes, and a stormwater treatment facility. After below ground infrastructure has been installed, roadway segments impacted by excavation work will be re-paved.

This project will resolve ponding surface water issues on South 188th Street and treat street runoff for heavy metals and other chemicals before it is discharge to the Des Moines Creek basin. 

• New asphalt overlay of streets impacted by this project.
• New stormwater conveyance and treatment infrastructure.
• Construction of new water main in partnership with Highline Water District.
• ADA-compliant pedestrian facility improvement.

    Pictured above: 16th Ave South, facing south
    Pictured below: 16th Ave South and South 188th Street Stormwater Improvements Vicinity Map