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
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
UW (distressed salmon): 253-254-7030 x8007
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
Message from TCA Board President Dan Keefe   Â
I would like to take this opportunity to congratulate and introduce TCA’s newly elected officers and at-large board members – as well as provide a brief overview about what our board’s engaged in, including an unprecedented opportunity to apply for rather large King...
Twin Ponds Park–Weekly Sunday Work Party!
Join Jim, Gary and Yoshiko on Sunday mornings at Twin Ponds Park! We see different wildlife with the changing seasons and that inspires us to nurture the natural areas of Twin Ponds Park. We pull out invasive species, love OM, and dream about the next big planting of...
First Steps Toward a Natural Area at Willow Creek
Responding to advocacy from Thornton Creek Alliance, the Seattle Parks and Recreation Department is seeking funds to acquire the pieces for a new, two-acre natural area along Willow Creek, just north and east of the Shanty Tavern, at 9002 Lake City Way NE. In March,...
Development at Patty’s Eggnest in Northgate
TCA has a Land Use Committee open to membership that reviews plans for urban development in our watershed. We support density in our neighborhoods, and we encourage close community review of construction permitting and design documents to understand the environmental...
- There are no upcoming events.
- There are no upcoming events.
Latest Past Events
Twin Ponds Park–Weekly Sunday Work Party!
Twin Ponds Park 16501 N 155th St, ShorelineJoin Jim, Gary and Yoshiko on Sunday mornings at Twin Ponds Park! We see different wildlife with the changing seasons and that inspires us to nurture the natural areas of […]
Thornton Creek Alliance Member Meeting
Join us for the quarterly membership meeting this month. Title: Advocacy, Agreement, Action: How to Move the Needle: How can we work together to make a difference? Speakers: Representative […]
Build Lake City Together (BLCT) community meeting
Check enjoylakecity.org for meeting link.
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.