Stewardship & Vegetation Management
4-County County Cooperative Weed Management Area
The Clackamas/Clark/Multnomah/Washington County Cooperative Weed Management Area (4-County CWMA) is a partnership of organizations, agencies and non-profits dedicated to combating invasive weeds across the region. Member organizations have committed to these efforts for a variety of reasons: supporting agricultural production, protecting human health, and preserving air, water and soil quality.