Downtown/Redmond Way Stormwater Treatment Facility

Project Summary

The stormwater treatment project for the City of Redmond involved construction of approximately 1,350 linear feet of storm drainpipe improvements ranging in size from 24-inches to 60-inches in diameter.  The scope of work included construction of below-grade stormwater diversion structures, below grade stormwater pump station, a below-grade stormwater treatment system for treating the Downtown Redmond drainage basin, and installation of a new 54-inch concrete stormwater outfall into the Sammamish River.  The project also included roadway and site restoration including traffic control loops, ADA ramps, driveway, sidewalk, and parking lot reconstruction, and extensive water and sanitary sewer line relocations. IMCO self-performed 80% of the work on the project.



Redmond, WA


City of Redmond

Contract Amount

$7.2 Million




June 2014 - April 2015

Project Highlights

The project required installation of a 54-inch concrete outfall into the Sammamish River within a two week in-water work window.