This project will retrofit eighteen catch basins and/or curb inlets, located along Northeast Hazel Dell Avenue from Northeast 78th Street to Cougar Creek, with media filter cartridges.

What does this project do?

Clark County recently completed a sub-basin level study of the Cougar Creek basin to assess water quality and flow control needs. During the study, the County evaluated water quality conditions along several high-traffic roadways within the basin. Northeast Hazel Dell Avenue is one of the locations identified with a high need for water quality treatment. Currently, highly polluted runoff captured by storm drain inlets gets directly discharged to the creek without any treatment. To improve water quality, cartridges that filter pollution from runoff will be added to eighteen catch basins/curb inlets along Northeast Hazel Dell Avenue between Northeast 78th Street and Cougar Creek.

This segment of Northeast Hazel Dell Avenue was selected over others mainly due to its urgency of water quality needs and its likelihood of not conflicting with any ongoing or near future road improvement projects.

What area is covered by this project?

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This project will replace below-ground stormwater structures to filter stormwater runoff from Northeast 99th Street between I-5 and Northeast Highway 99. The goal of this project is to provide water quality treatment before the runoff is discharged to Tenny Creek. 

About the project

The project will install 19 storm filter catch basins and curb inlets with media filter cartridges to treat stormwater runoff on Northeast Highway 99, between Northeast Hazel Dell Plaza and Northeast 102nd Street. 

What does this project do?

The project is located on Northeast Highway 99 between Northeast Hazel Dell Plaza and Northeast 102nd Street. Stormwater runoff is collected in a network of catch basins and curb inlets and conveyed and discharged to Tenny Creek just north of Northeast 102nd Street. There are two parallel storm lines on Highway 99: one on the west side, and the other on the east side along the curb lines. The two parallel systems come together near Northeast 102nd Street and then discharge to Tenny Creek. Tenny Creek flows northwest and discharges to Salmon Creek.

The goal of the project is to treat stormwater from 4.9 acres of established and developed right of way before it enters local creeks. Storm filter catch basins and curb inlet units will treat stormwater runoff. 

What area is covered by this project?

Click here for a map of the project location. 

The project will install a stormwater filter vault and 10 storm filter catch basins with media filter cartridges to treat stormwater runoff from Northeast Highway 99, between Northeast 78th Street and Northeast 86th Street. 

What Does the Project Do?

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.

What Area is Covered by the Project?

Click here for a map of the project location.