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About SPU
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Drainage & Sewer System
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Projects
Thornton Creek Water Quality Channel
The Thornton Creek Water Quality Channel project will use natural drainage system technology – drainage that mimics the way nature works - to clean the water, slow it down and let water flow through the channel year-round. The design will also include native landscaping and pedestrian pathways that provide access throughout the site with connections to the Lorig mixed-use development, ERA Care Development, the King County Transit Center, the Northgate Mall, the new Library and Community Center just up 5th Avenue NE, NE 100th Street and 3rd Avenue NE
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Aerial photo of project site taken on Octoberr 15, 2008.
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Located at the headwaters of the South Branch of Thornton Creek, this site offers the last available opportunity to improve the quality of stormwater runoff before it reaches the creek. The channel design will divert stormwater from the drainage pipe under the site to a series of surface swales (or small ponds) landscaped with special soils and native plants. These swales slow down the water, allow it to seep into the soil, and remove pollution before the water reaches the creek.
The channel will have water flowing in dry weather, as well as clean stormwater from the frequent storms. The existing storm drain pipe will stay in place to carry high storm flows when the channel cannot handle all the stormwater volume.
Plan view
Thornton Creek Water Quality Channel Project plan showing connections to pedestrian pathways and the rest of the mixed-use development.
How can I get more information?
For questions or additional information, please contact us at (206) 733-9081.
Project Update 1/30/2008 (PDF)
Related links
Drainage Projects
Links on other sites
Mayor Nickels’ Northgate Drainage Project Site
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