Oswego Lake Watershed Council

English Ivy covering a tree trunk

First Addition Tree Ivy Work Party!


Looking for 10 community members who are up to the challenges of cutting and removing ivy vines from trees on the slope toward Tryon Creek on Saturday, July 2nd from 9-11am.

Please email Kathleen Wiens wiensworld4@gmail.com if you would like to assist removing ivy from 20-25 trees.


Curious to see what happens to a pair of cotton undies when it’s buried in 6-8 inches for 60 days? This query may have never occurred to you, but we bet you’re wondering now!

In the name of building healthier soil, our 2nd Annual “Soil Your Undies”  participants accepted the challenge to “plant” a pair of cotton undies in their yard or garden and dig it up after two months.

On July 13th, OLWC will be holding a family-friendly open house style event at West Waluga Park to celebrate soil health and to showcase the results of our 2022 Soil Your Undies challenge! There will be soil science activities, crafts, and our infamous soiled-undies clothesline.

If you are a 2022 participant excited to show off what’s left of your undies, or if you’d just like to stop by to see what Soil Your Undies is all about, please RSVP for our Reveal event here!

Special thanks to our partners at Clackamas Soil and Water District for helping us make these educational activities happen!

OLWC Nature Day Camp

This summer the Oswego Lake Watershed Council is excited to be partnering with Lake Oswego Community Schools to offer a brand new Nature Day Camp brought to you by former Tryon Creek and Portland Water Bureau educators.

When:  July 18 – 22
Time: Monday – Friday, 8am – 12pm
Where:  Uplands Elementary School Room C-29
Ages : 4 – 6 ( PreK – Kindergarten)
Cost : $250 (scholarships available)
Minimum Participants : 5
Max : 10

This Nature Day Camp will provide opportunities for 4 to 6 year olds to connect with nature through a variety of activities including guided exploration of Springbrook Park, nature based songs, games, and craft projects. Each day of the 5 day session will have a theme that will incorporate ecosystem functions like soil, water, and the wildlife that lives in the urban forest.


Policemans Helmet

Weed of the Month: Policeman's Helmet

Policeman’s helmet (Impatiens glandulifera) is an invasive weed that grows in ditches, wetlands, and along waterways where it displaces native vegetation along stream sides by forming tall, dense stands and shading out competing vegetation.  It can have detrimental impacts on our streams and rivers.   As an annual, when policeman’s helmet plants mature and set seed they die back leaving riparian soils exposed and unprotected.  When the water levels in our streams begin to rise in winter the policeman’s helmet has largely disappeared, leaving behind nothing to prevent erosion or protect water quality.



2022 Local Native Plant Sales

Whether you’re planting or planning, good things to know!

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.

For more resources including what plants to use for different conditions (sunny & dry, shady & wet, etc.), you may want to also look HERE.


covid-19 virus


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.


Black Lives Matter

Black Lives Matter

The murders of George Floyd and Breonna Taylor at the hands of the police have reinvigorated national conversations around racial justice, and police violence against Black people. We condemn this racial violence.

Environmental justice is inherently linked with social and racial justice. We cannot have a safe and healthy watershed unless we address the conditions that harm folks who live in our community. We envision a world where a black man can hike through our local parks and birdwatch without fear of surveillance or violence. Where everyone can breathe, and have access to clean air and clean water.