Lake Oswego Watershed Council

The Oswego Lake Watershed Council (OLWC) is a locally organized, non-profit, non-regulatory watershed stewardship organization established to improve the condition and health of the Oswego Lake watershed and its stream network.


Oswego Lake Watershed Council’s number one priority is the health of our community and volunteers. We appreciate all of you and want you to know that our staff is closely monitoring the spread of COVID-19 and taking appropriate measures to ensure that we are doing our part to promote wellness in the community. OLWC will be making changes to scheduled events on a case-by-case basis as to ensure that we are following the most up-to-date recommendations by the WHO, CDC and OHA.

This means that until further notice, all volunteer events are subject to change – we will contact all volunteers in the event of a cancellation. In addition, OLWC asks any individual who is feeling ill or suspects that they have been exposed to any communicable disease (including, but not limited to, COVID-19) stay home.

We will continue to engage with the OLWC community online by using email and our social media platforms. As always, if you have any questions or concerns, please do not hesitate to reach out to us. We appreciate your patience and hope that all of you continue to stay healthy during this challenging time.

Take care,
OLWC Staff and Board

Arbor Week Community Ivy Pull

This April 5-12 be an urban forest hero and protect your neighborhood trees from invasive ivy!

4th annual State of the Watershed

We’re going virtual!

April 8, 2020

You Can Help

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

Welcome Aboard Kat Maloney!

Please welcome our new Community Outreach Specialist, Kat Maloney! She will be leading our outreach and education efforts and is looking forward to meeting all the wonderful community members who work with OLWC.


Council Support from Clackamas SWCD

Oswego Lake Watershed Council has been awarded a Watershed Council Support Grant by Clackamas Soil and Water Conservation District for this fiscal year! Clackamas SWCD is a valued partner that supports us financially and through technical support.



Oswego Lake Tree Summit

Let’s Branch Out and
Talk Trees Together!

The Tree Summit is in partnership with the Oswego Lake Watershed Council, the Lake Oswego Sustainability Network, the Mountain Park Homeowners’ Association, and 14 neighborhood associations.


Weed of the Month: Garlic Mustard

Garlic mustard (Alliaria petiolata) is an increasingly invasive weed in our community. Native to central and western Europe, this fast-growing plant commonly invades sites such as parks, trails, roadsides, and streamsides. April is a great time to manage this priority invasive weed on your property.


2020 Local Native Plant Sales

Click on the image above to find local sources of native plants, including local plant sales, as well as retail, wholesale and native plant seed suppliers. 

This list, provided by the East Multnomah WSCD is not comprehensive and is not an endorsement of any organization or business. It is intended to provide a starting place for your own research. For more resources including what plants to use for different conditions (sunny & dry, shady & wet, etc.), click here.


Resources for Residents

Be a part of the solution. There are many ways to help protect watershed health at home.

The links on this page provide useful information to help you improve water quality and wildlife habitat in your yard and your community.