Your Watershed
About TCA
Join TCA
Make a Donation
Help TCA with a financial gift
We are a group of dedicated volunteers who are working to preserve and protect our urban watershed. We work on multiple fronts: habitat restoration, issue advocacy, and education and outreach. Your support is welcome and would be gratefully accepted. We’re a 501(c)(3) nonprofit organization; your donation is tax-deductible to the extent allowed by law.
Become a Community Scientist
Learn how to help your community
Members and volunteers monitor pollutants and collect data at a variety of locations along the creek. Using this information, we partner with Seattle Public Utilities to pinpoint pollution sources and improve the water quality for everyone. Join this innovative program to keep Thornton Creek and it residents thriving in their urban setting.
Our recent projects
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Thornton Creek Hotlines — to report issues, CALL:
Pollution Spills & Waterway Problems
City of Shoreline 24/7: 206-801-2700
WA Dept. of Ecology: 800-258-5990 –or- 425-649-7000
Illegal Dumping
Shoreline 24/7: 206-801-2700
Erosion
Shoreline 24/7: 206-801-2700
Fish & Wildlife
WA Dept. Fish & Wildlife: 425-775-1311
Illegal Tree Cutting
On private property:
Seattle Code Compliance Division of Department of Construction and Inspections: (206) 615-0808
Shoreline Planning & Community Development Department: (206) 801-2500
On public street/city right-of-way:
Seattle Department of Transportation: (206) 684-8733
Shoreline Customer Response Team Code Enforcement: (206) 801-2260
On Parks property:
Seattle Parks Department: (206) 684-4113
Shoreline Customer Response Team Code Enforcement: (206) 801-2260
What you can do
Salmon-friendly gardening
Create a pesticide free zone in your yard and garden.
The abundant rain we get washes chemicals and pesticides into the creek, and eventually into Puget Sound. Control invasive plant species such as blackberry, ivy and laurel. Check out our resources for going organic and natural in your yard.
Wash your car … at a car wash!
When you wash your car on a paved surface such as your driveway, street or parking space, the contaminated water (even if you use biodegradable soap) goes right into the storm drains and can harm fish, other aquatic life and animals. The best option is a commercial car wash since the water goes through the sewer system, and many car washes reuse the water several times.
Recent News
Upcoming Events
Developing a Lushootseed Name for the New Lake City Natural Area
Since early last year, Thornton Creek Alliance has been working with Muckleshoot and Duwamish representatives on a possible Lushootseed name for the new natural area that the City of Seattle acquired along the creek at 2318 NE 125th Street in 2019
Thornton Creek Alliance Public Meeting: July 29th, 2021
Plan progressing for the new natural area along Thornton Creek at NE 125th St.
Audio & Video recordings of the May 5th, 2021 Thornton Creek Alliance General Meeting
Join BJ Cummings, author of The River That Made Seattle, for an exploration of the historic and contemporary events that have shaped the Duwamish watershed. If you were unable to attend this presentation, we have made a recording of the video and audio for you to...
Thornton Creek Alliance Public Meeting: May 5th, 2021
Join BJ Cummings, author of The River That Made Seattle, for an exploration of the historic and contemporary events that have shaped the Duwamish watershed.
- There are no upcoming events.
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- There are no upcoming events.
Latest Past Events
Tree Care Event at Meadowbrook Pond
Join us at Meadowbrook Pond for the Tree Care Event on Saturday, February 27th, 2024 Saturday, February 24, 202410am - 1pm Meet at the end of 36 Ave NE near […]
Presentation: ‘Private Eye Beaver Investigation – one dam at a time with Pamela Adams’
Join us via Zoom through the TCA General Membership Program to learn about the beavers (and fish!) in your watershed by behind the scenes observation (details forthcoming).
Volunteer in the Kingfisher Natural Area doing community reforestation along Thornton Creek
Please RSVP for this event here: https://seattle.greencitypartnerships.org/event/38421/ Activities We will be providing instruction on non-native plant species identification, and removal as well as directions on proper conifer planting techniques. Come […]
Year Alliance Formed
Anniversary
Members & Growing
Events per Year
New members are always welcome!
The larger the group, the greater the voice for a healthier watershed.