The Clackamas, Clark, Multnomah, and Washington County CWMA (Informally known as the 4 County CWMA) exists to create and support collaborative weed management among land managers and owners in and around the greater metropolitan area of Portland Oregon.  Noxious weeds extend across multiple ownerships and travel over the landscape.  For this reason, collaboration and partnerships are essential for effective management.  In addition, partnerships can access new sources of funding and increase implementation efficiency.  The CWMA promotes weed education/outreach, weed inventory and prevention, and weed control activities.

CWMA Management Plan

CWMA MOU