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An Elegant Solution to Stormwater Pollution in Duvall, WA

For years now, Stewardship Partners has been working alongside local Snoqualmie Valley schools, libraries, municipal governments, and businesses to install green stormwater management features such as rain gardens, cisterns, and rain barrels. Back in 2021, we were awarded King County Flood Control District Flood Reduction Funds to install some signage and features (possibly a rain garden) in the city of Duvall. We teamed up with the City of Duvall and our old amazing friends, Luke & Sarah, at The Grange. The initial idea was to install a rain garden and some signage at the restaurant. After many iterations of planning and design drafts with our other friends at MxM Landscape Architecture we decided a biofiltration box would be the best option for the Grange site. We posed the idea to Luke and Sarah, and they loved it! We then worked with yet \more friends at Dirt Corps to purchase and install a beautiful prefabricated artful biofiltration box. The box was built and designed by Tabasco Mills of the Blacksmith Shop in Seattle. The installation of the box entailed clearing a space for the box, two different types of forklifts to move and place the box and staff from both Dirt Corps and Stewardship Partners! Postponed by flooding, the box finally had a new home at the Grange!

In addition, we have installed signage in these highly traveled areas that explains how the green stormwater management features work and why they’re so important to the community and environment. This is another prime example of Stewardship Partners collaborating with many partners and friends to accomplish our goals!

  • Installed Biofiltration Box
  • Bamboo Removal Before Install
  • After Install
  • Beautiful Biofiltration Box
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Adopt-a-Downspout Ramping Up

Our Adopt-a-Downspout program has been in full swing this year! Stewardship Partners is expanding our pilot program in Seattle to capture and treat polluted runoff with biofilter boxes, known as Boxes of Rain. 6PPDQ is a toxic chemical that originates from vehicle tires and kills coho salmon and many other fish species. On average, a Box of Rain filters out 92% of 6PPDQ from polluted stormwater before it enters local waterways. 

After the success of our pilot program under the I-5 Ship Canal Bridge and securing $1 million of funding last year for this program, we are continuing to grow momentum! Earlier this summer, we installed 2 more Boxes of Rain underneath the I-405 to I-90 HOV on-ramp in Bellevue. This site along with 2 more Boxes of Rain to be installed at the I-5 Ship Canal Bridge will be monitored for effectiveness as we pursue a TAPE certification. This approved best management practice by the Department of Ecology will verify the value in Box of Rain technology and encourage more installations statewide. 

As we work to install more boxes for cleaner water and healthier salmon, we have created a Design Guide, Installation Guide, and Operations & Maintenance Guide for Boxes of Rain. These guides are publicly available on our website and will be used by Stewardship Partners to facilitate helping new interested partners in replicating sites with our expert guidance. Our staff have presented at various conferences this year to inform others of this effective resource to protect our water, including the Green Tribal Summit just last week.

Amazing Adopt-a-Downspout Volunteers from Northwest Fly Anglers

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10 Years of the Green Infrastructure Summit

We had a wonderful time at the 2025 Green Infrastructure Summit of the Salish Sea on March 14th! This was a landmark year for the Summit, being the 10th year of coming together as a community, collaborating across sectors, and connecting our Salish Sea region. We saw an unprecedented number of fantastic speakers along with the highest number of student attendees in all 10 years.

Many thanks to our wonderful speakers, host committee, sponsors, advisory committee, volunteers, Cascadia Consulting, and everyone who was able to attend. We recognize and appreciate the time and energy you put in. You all make this event what it is!

Stay updated on GSI and the Summit by following Stewardship Partners on Instagram, Facebook, LinkedIn, and signing up for our Green Infrastructure email list.

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SP Featured by KUOW

Stormwater runoff is the leading source of pollution in Puget Sound, and Stewardship Partners is working to keep contaminants out of our waterways with our Adopt-a-Downspout program. Our pilot project captures and filters runoff from the busiest highway in Washington. Learn more about the threat of polluted runoff and our Adopt-a-Downspout program in KUOW Radio’s recent article! 

SP Board Member Dakota Keene being interviewed by KUOW at the Ship Canal Bridge site