The project is located on Highway 99 from 78th to 86th Street. Generally, stormwater runoff is collected in a network of catch basins and storm pipes and drains to Cougar Creek. The 21 catch basins in the project area drain to two mainlines that also receive additional flows. The existing storm sewer system then discharges untreated runoff into Cougar Creek, a tributary of Salmon Creek. This project plans to treat 7.9 acres of established and developed right of way. 

This project will install a stormwater filter vault and catch basins with filter cartridges to provide basic treatment for stormwater runoff from Northeast Highway 99. A vault with peak diversion will be installed to treat along the existing storm sewer main line. Additionally, ten stormwater filter catch basins will be installed upstream of existing catch basins.

Click here for a map of the project location.