Who We Are
We are urban, rural, and forested - learn more about the 4 County CWMA.
Our Committees
We have four active committees that work on various aspects of collaborative weed management.
Our Partners
Our work is not possible without the involvement and dedication of our partner organizations. Learn more about them here.
Annual Reports
View a comprehensive report detailing the projects and financial performance of the 4-County CWMA.
Calendar
Learn about upcoming events and how you can help out.
Pull Together
Learn all about the Pull Together symposium.
Report An Invasive Species
Help us manage invasive species across the 4-county region by reporting it.
Data Collection
Learn the standardized data collection procedures outlined by our mapping and data committee.
Data Sharing
Discover where and how to share data with the locally relevant invasive species databases.
Garlic Mustard Working Group
Discover everything there is to know about garlic mustard in the Pacific Northwest.
Weed Treatment Calendar
The best methods and timing for weed treatments for professionals.
Weed Management Resources
Learn to identify some of the common trouble species in our region and get tips on how to control them.
Our cooperative weed management area is made up of Washington, Multnomah, and Clackamas Counties in Oregon; and Clark County in Washington.
Click on a partner's office location to view their jurisdictional boundary and contact information.
