Capital Improvements and Maintenance

The goal of the City's Surface Water Maintenance (SWM) Division is to prevent urban flooding and reduce the discharge of pollutants into streams and the Puget Sound through proactive maintenance of the drainage infrastructure.

City Drainage Standards

The 2021 King County Surface Water Design Manual has been adopted (DMMC 16.10.350) by reference as the City of Des Moines storm water standards.

2021 King County Surface Water Manual

City Pipe Program

Those street ditches can be filled! In a joint venture with the home owners, Public Works crews will provide the heavy equipment and labor to install pipes, catch basins and backfill material (gravel) to fill in the ditches if the owner pays for the materials. For those interested, a cost estimate can be obtained from John Blackburn at (206) 870-6559 or email. He would be happy to make a site visit and suggest improvements that are needed for your particular site (some restrictions apply).

Current Capital Improvements Projects

In Construction

  • 8th Ave S (S 264th St to S 265th St) Pipe Project
  • S 239th St /6th Ave S Pipe Replacement
  • Sound View Drive/Redondo Beach Drive Pipe Upgrade Project

In Design

  • Barnes Creek/Kent Des Moines Rd Culvert Project
  • N. Fork McSorley Creek Diversion
  • 24th Ave S Pipe Replacement/Upgrade 

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