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Magnolia Wet Weather Storage Facility at Smith Cove
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In July 2018, King County’s Wastewater Treatment Division released the 2017 Annual CSO and Consent Decree Report.
Combined Sewer Overflows (CSOs) in King County exist in older Seattle neighborhoods like Magnolia, where one set of pipes carries both sewage and stormwater. When heavy rains fill the pipes, excess flows are released through a permitted outfall into Puget Sound. Once it is back in operations in late 2018, King County’s Magnolia Wet Weather Storage Facility will help reduce CSOs from the outfall off 32nd Avenue West to no more than one per year on a long-term average.
King County has provided regulators with a supplemental compliance plan and updates during the Magnolia remediation project. You can find a summary and list of CSOs in 2017 in the annual report .
- The Magnolia Wet Weather Storage Facility is back online, restoration wrapping up, January 15, 2019
- Restoration activities ongoing, November 29, 2018
- Fall newsletter - King County's Magnolia Wet Weather Facility on track to resume operations, November 2018
- Restoration continues, September 28, 2018
- Restoration resuming throughout the Magnolia project area, September 13, 2018
- Restoration work to resume on West Galer Street week of September 17, September 12, 2018
- Shoring removal on 32nd Avenue West beginning week of September 17; early hours equipment delivery Friday, September 14, September 11, 2018
- Current phase of drilling on West Galer Street complete on Friday, August 17, August 20, 2018
- Drilling on West Galer expected to wrap up in mid-August; annual CSO report posted, August 2, 2018
- Restoration work resumes on West Galer Street and 32nd Avenue West, July 26, 2018
- Restoration work continuing on West Galer Street and 32nd Avenue West, June 18, 2018
- Crews continue work on West Galer Street the week of June 11, June 7, 2018
- Survey work on West Galer Street, May 31, 2018
- Crews working tonight on West Galer Street, May 24, 2018
- Update: Pipe installation activities begin Wednesday, April 25, April 24, 2018
- Lane closed on Clise Place West, work Saturday and Sunday at 32nd Ave. W. and Smith Cove Park, March 23, 2018
- Preparation for pipe bursting continues, and short delays on 32nd Avenue West, March 14, 2018
- Progress update and reminder about project updates, March 2, 2018
- Update: Important project updates on our Online Open House, February 27, 2018
- Crews make progress on 32nd Ave. W. and prepare for soil freezing in Smith Cove Park, February 16, 2018
- King County’s contrator continues work to prepare for pipe installation, February 9, 2018
- Update: Equipment arriving, site preparation on 32nd Avenue West, February 2, 2018
- Project update, January 22, 2018
- Project update, January 12, 2018
- Construction continues to ramp up in Smith Cove Park, December 28, 2017
- Visit our Online Open House to learn more about construction activities, December 18, 2017
- Project update, December 12, 2017
- King County's contractor to begin work in Smith Cove Park, November 27, 2017
- Update on Magnolia Pipe Replacement Project, October 20, 2017
- Smith Cove Park athletic fields temporarily re‐opened; sewer inspection crews on 32nd Ave. W. Sept. 11, September 6, 2017
- Damaged Pipe Investigation Summary, Summer 2017
- Restoration in West Galer Street work area during the week of June 5, June 1, 2017
- King County resumes work to stabilize area around damaged sewer pipe, February 17, 2017
- Damaged pipe investigation - presentation, February 16, 2017
- Damaged pipe investigation - meeting summary, February 16, 2017
- Damaged Pipe Investigation Update -- February 16 meeting, February 6, 2017
- King County contractor to start cleaning out damaged sewer pipe, January 3, 2017
- King County work to locate break, stabilize area around damaged sewer pipe , December 23, 2016
- King County crews to locate break, stabilize area around damaged sewer pipe under West Galer Street, December 6, 2016
- King County crews investigating sewer pipe damage in Magnolia, November 30, 2016
- Project update, October 30, 2015
- Final paving on 32nd Ave W, July 23 - 24, July 21, 2015
- Traffic flow changing as work continues on 32nd Ave W, Week of June 22, 2015, June 19, 2015
- Construction activities on 32nd Ave W, June 11 - June 18, 2015, June 11, 2015
- Construction activities on 32nd Ave W, June 2 - June 8, 2015, June 2, 2015
- Construction activities on 32nd Ave W, April 29 - May 7, 2015, April 29, 2015
- Shoring removal begins at storage tank site on April 6, April 3, 2015
- Construction activities on 32nd Ave W, March 20 - 27, 2015, March 20, 2015
- Construction activities on 32nd Ave W, March 9 - 13, 2015, March 11, 2015
- Construction activities on 32nd Ave W, February 23 - 27, 2015, February 20, 2015
- Underground diversion structure installation underway on 32nd Ave W, February 3, 2015
- Winter 2015 Newsletter, February 2015
- Cleanup from drilling operations on 32nd Ave W this week – next phase begins week of January 12, January 5, 2015
- Work continuing on 32nd Ave W the week of December 22nd, December 18, 2014
- Drilling activities wrapping up the week of December 15, December 15, 2015
- Construction activities on 32nd Ave W; road closure and pipeline pullback will begin Friday, December 12, December 10, 2014
- Overnight sewer pipe activities on 23rd Ave W for two nights between December 12 - 17, December 8, 2014
- Construction activities on 32nd Ave W; crews beginning preparation for pipeline pull week of December 1, 2014, December 3, 2014
- Construction activities on 32nd Ave W; pipe fusion complete, pipeline pullback approaching, November 24, 2014
- Construction activities on 32nd Ave W, final step of drilling process to begin this week, November 17, 2014
- Construction activities on 32nd Ave W; expect additional traffic delays week of November 10, November 7, 2014
- Overnight work needed for the new Combined Sewer Overflow (CSO) storage tank, November 7, 2014
- Construction activities on 32nd Ave W, week of November 3rd, October 31, 2014
- Update: construction activities on 32nd Ave W, week of October 27th, October 24, 2014
- Update: construction activities on 32nd Ave W, October 17, 2014
- Construction activities on 32nd Ave W, Oct. 9, 2014
- Fall 2014 newsletter, September 2014
- Construction activities on 32nd Ave W, Sept. 12, 2014
- Construction activities on 32nd Ave W beginning September 2, 2014, Aug. 29, 2014
- Overnight power outage at Elliott Bay Marina, Aug. 19, 2014
- Street restoration for Smith Cove area, Aug. 14, 2014
- Overnight work in the Magnolia Bridge/Smith Cover area, July 11, 2014
- Installation of monitoring equipment beginning July 15, 2014, July 10, 2014
- Overnight work in the Magnolia Bridge/Smith Cove area, July 3, 2014
- Construction to begin on 32nd Ave W the week of June 23, June 18, 2014
- Magnolia CSO permit hearing scheduled for July 8, June 14, 2014
- Preconstruction community meetings notice, April 25, 2014
- Notice of overnight work for the Magnolia CSO control project, April 6, 2014
- Construction begins on King County’s new South Magnolia CSO control facility! March 28, 2014
- Winter 2014 newsletter, January 2014
- Spring 2013 newsletter, May 2013
- Project timeline, May 2013
- Fall 2012 newsletter, September 2012
- Noise monitoring in your neighborhood, September 14, 2012
- Community meeting: design concept for the new CSO control facility at the Port of Seattle’s West Yard
Wednesday, June 13, 2012, 6 - 8 pm
Discovery Park Environmental Learning Center, 3801 Discovery Park Boulevard, Seattle
View meeting materials on the meeting calendar page - Community meeting
Wednesday, February 15, 2012, 6:30 - 8 pm
Magnolia Community Center, 2550 34th Ave W, Seattle
View meeting materials on the meeting calendar page - Community meeting: technical information session
Saturday, January 21, 2012, 11:00 am - 2 pm
Discovery Park Environmental Learning Center, 3801 Discovery Park Blvd, Seattle
View meeting materials on the meeting calendar page - Community meeting
October 20, 2011, 6:30 - 8:30 pm, presentation begins at 7:00 pm
Catherine Blaine Elementary School Cafeteria, 2550 34th Ave W, Seattle
View meeting materials on the meeting calendar page - Geotechnical field investigations in Magnolia; work begins the week of September 26.
Map: geotechnical boring locations, September 23, 2011 - Community meetings (Aug. 17 and 18, 2011) – King County project team met with neighbors to discuss project elements and need for this project, upcoming geotechnical investigations in the area, and respond to questions and concerns.
View meeting materials and summary on the meeting calendar page - A State Environmental Policy Act (SEPA) Determination of Nonsignificance (DNS) was issued on May 23, 2011 for this project. Comments must be submitted by June 8, 2011. The SEPA DNS and environmental checklist can be viewed here.
- March 3, 2011 presentation at Magnolia Community Center (public meeting). View meeting announcement and summary.
Meeting topic: the Port of Seattle and the City of Seattle are discussing a possible land exchange and creation of a new waterfront park in the Smith Cove area where King County plans to build an underground CSO storage facility.
- Restoration on 32nd Ave W, September 2014
- King County is moving toward construction of the South Magnolia CSO control project, updated May 2014
- Facility siting and design, May 2013
- Site design and architecture, May 2013
- Plant palette, May 2013
- Profile of infrastructure on 32nd Ave W, March 2012
- Geotechnical findings for the South Magnolia CSO control project, February 2014
- Trenchless construction: Horizontal Directional Drilling (HDD), updated November 2014
- Dec. 18, 2017 – Construction begins on Magnolia pipeline repair project
- Nov. 30, 2016 – King County investigating damaged sewer pipe in Magnolia
- Oct. 22, 2016 – WTD Blog: Wastewater Facilities Provide Homes for Wildlife
- June 5, 2015 – WTD Blog: Construction project leads to archeological discovery in Magnolia
- May 31, 2013 – Community celebrates expansion of Smith Cove Park
- April 18, 2013 – Mayor, County Executive, Port announce deal for water quality improvements and new park at Smith Cove
SEPA environmental checklist, issued May 23, 2011
This engineering report (facility plan) outlines improvements to the King County conveyance system serving the South Magnolia basin that are necessary to control CSOs in compliance with RCW 90.48.480 and WAC 173-245-020 (22).
This report is submitted in compliance with the first of three compliance schedule dates noted in Section S18 of the West Point Treatment Plant National Pollutant Discharge Elimination System permit (refer to page 53 of permit).
Final engineering report (facility plan), September 2011
Draft engineering report (facility plan), December 2010
- Cover
- Title page, table of contents, abbreviations, and acronyms
- Chapter 1. Executive summary (3.6MB)
- Chapter 2. Introduction
- Chapter 3. Existing conditions (3.9MB)
- Chapter 4. Basis of planning
- Chapter 5. Alternatives development and evaluation (60.9MB)
- Chapter 6. Proposed alternative (5.8MB)
- Chapter 7. Financial analysis
- Chapter 8. Implementation plan
- Chapter 9. Miscellaneous requirements
- Appendices