S 140th St & Des Moines Memorial Dr Trunkline Project

Project Location

S 140th St, between 8th Ave S and Des Moines Memorial Dr S

Project Overview 

This project was first included in the 2014 Northeast Redevelopment Area (NERA) Master Drainage Plan. Planned redevelopment of properties within NERA will require upgrades to the stormwater conveyance system along S 140th St.

This project consists of constructing a new large diameter stormwater trunkline within S 140th St, along with improvements to the existing outfall into Miller Creek and water quality improvements for the roadway affected by the project.

Improvements include:

  • Construction of approximately 630 linear feet of new 24- and 30-inch stormwater pipe, to replace the existing 12” pipe that has reached capacity.
  • Construction of flow control and water quality improvements via a dispersion system on the south side of 140th.
  • Construction of a stormwater outfall into Miller Creek on the south side of S 140th St, to replace the existing outfall on the north side of the street.

Project Status

Scheduled Start Date: Summer 2023 (construction)
Scheduled Completion Date: Winter 2023/2024

Neighborhood Impact 

Construction work will occur within the roadway and shoulders of S 140th St. It is expected that the contractor will allow local traffic to pass, but there may be short delays for maneuvering equipment, etc. Short-term full road closures will likely occur while the road crossings are installed. Access will be maintained throughout the rest of the street during these closures.

Access to all properties will be maintained for the duration of the project work, though vehicular access may be limited during the workday while active construction is occurring in front of driveways. Residents will be encouraged to either park elsewhere on the street during these times, or move vehicles out of driveways in the morning to prevent access issues.

Additionally, storage of construction equipment and project materials will take place along portions of S 140th St for the duration of the project. This may limit available parking on the road shoulders, but access to driveways will be maintained.

Project Manager

Dan O’Brien

Stormwater Engineer

(206) 241-4647

[email protected]


Updated May 8, 2023