The Peterman Ridge unit is the largest on the Cowlitz Wildlife Area, with 6,840 acres south of Morton. It is managed for the pileated woodpecker (a sensitive species), black-tailed deer, and Douglas squirrels. Its forested wetland areas on Peterman Ridge also provide habitat for beaver, amphibians and other wetland- dependent species. Wildlife use throughout the unit is diverse, including elk, black bear, cougar, grouse, and turkey.