Overlake Village South Detention Vault Project

Vault rendering

Location:  15010 NE 20th Street
Project Phase: Complete
Timeline:  Project completed in July 2015
Contact: Steve Hitch, Senior Stormwater Engineer, 425-556-2891

In July 2015, the South Detention Vault was completed on time and within budget expectations. Overlake Village is now home to the largest stormwater detention vault in Washington State, capable of detaining millions of gallons of stormwater runoff. It might be hard to believe all that is happening beneath the parking lot!

This video shows an accelerated version of the work completed below the Sears parking lot. The video captures the construction that took place from April 2014 through May 2015. The new parking lot was constructed from May 2015 to July 2015.

The vault has a total volume of 20 acre feet (about 6.6 million gallons). Park facilities will be constructed on top of the stormwater vault in the future. In the meantime, the property owner will use the area over the vault for parking.

The South Detention Vault is the first of three regional stormwater facilities to be constructed in Overlake Village. The vault is in operation today and will immediately help reduce flooding downstream by detaining existing upstream storm flows. As private and public redevelopment continues in Overlake, more and more stormwater runoff will be treated locally prior to discharge to the Overlake South Detention Vault.

Related Documents

Key Project Facts
Kelsey Creek Watershed
Vault Drainage Area


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