Powell Butte, an extinct cinder cone volcano, rises near the headwaters of Johnson Creek – an urban creek with remnant populations of native salmon and steelhead. The park is comprised of 608 acres of meadowland and forest.

Abundant wildlife populates the park, including rabbits, ring-necked pheasants, ground squirrels, raccoons, gray foxes, skunks, bats, chipmunks, coyotes, and black-tailed mule deer. The park is home to many birds of prey with its open meadows, groves of wild hawthorn trees, forested slopes of Western red cedar, and wetlands near Johnson Creek.