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You can help protect watershed health! Volunteer to plant trees, sign up for our newsletter, host a presentation, or attend a free workshop.

Join us for periodic work parties involving the removal of invasive species and installation of native plants!  Please email Jack at to be added to our volunteer mailing list! You will be notified of new volunteer opportunities when they are scheduled.


February 21, 2024
  • Urban Forest Committee Meeting February 21, 2024  9:30 am - 11:00 am See more details

March 5, 2024
  • Tribal Histories of the Willamette Valley with David G. Lewis March 5, 2024  6:00 pm - 8:00 pm Tryon Creek State Natural Area, Portland, OR, USA

    The Willamette Valley possesses a rich history as the ancestral lands of tribes like the Kalapuya, Chinook, Molalla, and others for millennia. However, much of this history has remained unrecorded, incomplete, or inaccurately portrayed. David G. Lewis addresses this gap in his new book "Tribal Histories of the Willamette Valley" by blending years of archival research and oral traditions and offers a nuanced perspective on the Willamette Valley's history and the experiences of Indigenous peoples in this region. By bringing these stories back into focus, readers gain a more comprehensive understanding of the colonization endured by the Native peoples of the Willamette Valley-- experiences often overlooked in many other accounts of Oregon's history.

    Join Oswego Lake Watershed Council and Friends of Tryon Creek for an evening with Oregon local Indigenous historian David G. Lewis. David will be giving a presentation on his new release "Tribal Histories of the Willamette Valley" and answering audience questions. He will also be signing books, which can be purchased at the event.

    Where: Tryon Creek Nature Center

    When: Tuesday, March 5th 6-8pm

    Free to the public! Books will be available to purchase and you can preorder here:

    About the author: David G. Lewis, PhD and member of the Confederated Tribes of Grand Ronde, is a recognized researcher, scholar, writer and assistant professor of anthropology and Indigenous studies at Oregon State University. His publications include “Willamette Valley Treaties,” “A History of Native Peoples of the Eugene, Cascades & Coast Region,” and others. For more than twenty years, Lewis has been passionate about studying the original histories of the people of Oregon and California and has an extensive record of collaborative projects with regional scholars, tribes, local governments, and communities. Lewis’s research specializes in the history of Kalapuyans and other Western Oregon tribes, which he explores through journal essays and on his blog The Quartux Journal. He currently resides in Chemeketa, now Salem, Oregon, with his wife, Donna, and two sons, Saghaley and Inatye.

    See more details

March 8, 2024
March 16, 2024
  • Monthly Work Party at Westlake Oak Woodland March 16, 2024  10:00 am - 12:00 pm 14903 Westlake Dr, Lake Oswego, OR 97035

    Join Oswego Lake Watershed Council and Westlake Homeowners Association for a morning of invasive species removal and land tending at Westlake Oak Woodland. This natural area is undergoing active habitat restoration and is home to centuries old oak trees, wetlands, and streamside habitat. These 20 acres of urban forest provide habitat for Slender Billed Nutchatch and other oak associated wildlife. We will be pulling invasive ivy, shiny geranium, and other invasive species. Certain plant species can outcompete and suppress native plant communities. By removing these weeds, we create more space for native plants to thrive. 

    These activities require volunteers to be able to bend over, kneel. Volunteers will be hiking and working off trail on uneven ground. We can arrange alternate projects for those with different abilities or mobility issues. We will be working outdoors so please dress for the weather (long pants and layers are recommended). Sturdy, closed-toed shoes are required. Bring your own water bottle and gloves if you have a pair. Hand tools, gloves, and training will be provided. Please bring any medication you may need (Asthma Inhaler, Epi-Pen, etc.) Please do not attend the event if you are sick. Children are welcome if accompanied by an attentive adult. Unfortunately, there is no bathroom on site. Please stop by, learn about the ecology of the local watershed, and lend a hand as we enhance this unique habitat! Registration is required! Questions? Contact site Jack Halsey at

    To Sign up:

    See more details

March 19, 2024
  • OLWC Education & Outreach Meeting March 19, 2024  4:30 pm - 6:00 pm

    This OLWC Subcommittee meets monthly to discuss ways to connect with the community over watershed health. We develop outreach initiatives, plan events and fun, immersive education opportunities and ways to support LOSD Green Teams and other sustainability oriented programs at schools.

    See more details

March 20, 2024
  • Urban Forest Committee Meeting March 20, 2024  9:30 am - 11:00 am See more details

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OLWC COVID-19 Plan (Updated May 2021)

Oswego Lake Watershed Council (OLWC) prioritizes the safety of our community, including staff, volunteers, board members, contractors, interns, landowners, partners, and community members. Our COVID-19 field work plan lays out the protocols that will be implemented in response to the ongoing COVID-19 public health crisis in Oregon. This plan will be updated regularly in response to recommendations and requirements from the State of Oregon, Clackamas County, 

Center for Disease Control, and the World Health Organization. All staff, interns, and volunteers working as a representative of OLWC while conducting group work are expected to understand and follow these guidelines.



Educational Opportunities

  • Oswego Lake Watershed Tour   During Summer and Spring OLWC offers monthly watershed tours for area residents to introduce them to Oswego Lake Watershed and provide an overview of watershed science and issues affecting watershed health.  Transportation is in individual vehicles and carpooling for the tours is arranged at the beginning of the tour. Custom tours can also be arranged for groups of up to 15 individuals. Tours are free, but pre-registration is required.

    When: The third Saturday of each month from May through October,  9:00am – 11:00am

    Where: Uplands Elementary School, 2055 Wembley Park Rd, Lake Oswego, OR 97034, United States (map)

    Description: This field trip begins at one of the headwaters of Springbrook Creek and follows the creek route to Oswego Lake with visits at several key areas along the creek. The tour concludes at Oswego Creek as water leaves the lake and makes its way to the Willamette River. This event is free and family-friendly. RSVP is required. Please e-mail Stephanie at to reserve your space.

    RSVP Required — email to reserve your space.

  • Watershed Education Volunteers Needed
    Volunteers are needed to support school programs and watershed tours and programs.  We are particularly looking for individuals who are interested in supporting the 5th grade watershed programs at Tryon Creek or leading watershed tours. Training is provided for all volunteer opportunities. Please contact Stephanie Wagner at for details.


Volunteer Opportunities with Our Partner Organizations

Friends of Springbrook Park

Friends of Iron Mountain

As future work parties are scheduled you’ll find registration information at


Future Site of the Pollinator Garden
  • Education Events. Events throughout the school year (Dates to be determined.). Project Details: A member of Friends of Springbrook Park will partner with Lake Oswego School District and district faculty to develop and implement curriculum that encourages students to learn about and explore the plants, animals, and ecosystems of Springbrook Park.
    Contact: Anne Lider (503-701-2291).


Garden naturally:

Lake Oswego Backyard Habitat Certification Program

Watershed-friendly household maintenance:

  • Soak up driveway spills with kitty litter and throw in the garbage
  • Sweep your driveway instead of washing it
  • Dispose of household hazardous waste at a disposal facility – drains in the street lead to local streams
  • Install a rain garden to slow down and soak up stormwater runoff on your property

Maintain your vehicles to reduce pollution:

  • Fix vehicle fluid leaks to keep them from washing into streams
  • Wash your car at a car wash or over grass

Even your pets can help:

  • Please pick up after your pets – bacteria from dog waste pollutes our waterways