Overlake Village South Detention Vault Project
Vault in construction

Location:  15020 NE 20th Street
Project Phase: Construction is underway
Timeline:  Project scheduled for completion summer 2015
Contact: Joe O’Leary, Construction Project Manager, 425-556-2738 
Steve Hitch, Senior Stormwater Engineer, 425-556-2891

The South Detention Vault is the first of three regional stormwater facilities to be constructed in Overlake Village. It will detain stormwater that has been treated locally within public rights-of-way and private development areas.

When completed the vault will have 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.

Utility relocations to accommodate the new vault were completed in 2013. The vault is now under construction and will be operational by the end of 2014 with site restoration completed in 2015.

Check Redmond’s Traffic Alerts page for construction impacts to local streets.

Project Update: July 2014

Phase 2 - Overlake Village South Detention Vault Construction is Underway

NE 20th Street will be open during the day with lane restrictions. Traffic levels on other arterial roads in the vicinity of the project likely will increase during the construction periods. Work will occur primarily during the day time with the possibility of some night work.

The South Detention Vault will be constructed in three stages:

Stage 1
March - November 
(Construction begins on the vault's south cell)

Stage 2
November - January 2015

Stage 3 (final stage)

January 2015 - June 2015

Summer 2015: Project scheduled for completion

Project-Specific Information


March 4, 2014

February 18, 2014

June 18, 2013    
Council awards Phase 2 construction bid to Goodfellow Bros., Inc.

Council Final Acceptance: Phase 1 Utility Relocation Project

Utility Relocation project awarded to Shoreline Construction Co. by Council
April 23, 2013              Project Newsletter
April 17, 2013 Overlake Village Utility Relocation Plans
Dec 19, 2012           Stormwater Alternatives Analysis Report
Sept 5, 2012                 Geotechnical Engineering Report - GeoEngineers, Inc.
Nov 4, 2011    Project Newsletter
June 14, 2011   Overlake Facilities Overview Map
Mar 10,  2011    Consultant Selection Process Information Meeting Presentation
Feb 22, 2011 Preliminary Geotechnical Design Services Report
Nov 2010           Groundwater Elevations
Aug 31, 2010 Proposed Infrastructure Concept