The Tri-State Cooperative Weed Management Area (Tri-State CWMA) is located at the convergence of Oregon, Washington, and Idaho. This area of over 250,000 acres encompasses an astonishing variety of terrain, vegetation, uses and weed problems. Tri-State cooperators came together in 1995 in order to develop an integrated weed management approach to the weed problems of the area. Since then, this diverse group of land management agencies, county weed control supervisors, state agencies, private landowners, and the Nez Perce tribe has been working cooperatively to implement the plan.
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