The Powell Buttes are mountains with several summits located in Crook County, Oregon, United States. The highest summit is over . The mountains are geologically related to the Ochoco Mountains and are named after members of Joseph Powell's family. Geology The Powell Buttes are five rhyolitic buttes in western Crook County in Central Oregon. One of the buttes is considerably larger than the rest. Hat Rock is one of the named summits. In addition to the rhyolite, tuff and diatomite also comprise the buttes. Welded tuff has been found, showing it once comprised the Crooked River caldera. The buttes are morphologically related to the Ochoco Mountains. Low grade uranium was found in very small amounts along the western side of one of the smaller buttes. Environment and ecology In the summer, the environment around the Powell Buttes is dry and warm during the day and cool at night. In the winter, the weather is cold with snow occurring from October through April. Western juniper is the dominate tree species on the mountain. Big sagebrush, gray rabbitbrush, and antelope bitterbrush are the predominant understory vegetation. Low ground cover includes arrowleaf balsamroot, spiny phlox, common yarrow, longleaf hawksbeard, ragged robin, bitterroot, and nineleaf biscuitroot. Native grass species include wheatgrass, Idaho fescue, Sandberg bluegrass, and giant-heads clover. Numerous bird species are found on the Powell Buttes. California quail and mountain quail live on the mountain slopes. Other small bird species include black-capped chickadees, mountain chickadee, pine siskins, lesser goldfinches, American goldfinches, canyon wrens, rock wrens, cliff swallows, barn swallows, western meadowlark, mountain bluebirds, sage thrashers, American robins, mourning doves, and Brewers blackbirds. Larger birds include western scrub-jays, Steller’s jays, pinyon jays, Northern flickers, black-billed magpies, and American crows. Birds of prey found on or near Powell Buttes include American kestrel, Cooper’s hawk, northern goshawk, northern harrier, peregrine falcon, prairie falcon, red-tailed hawk, golden eagle, and bald eagle. Burrowing owls, barn owls, great horned owl, and turkey vultures are also common in the area around the mountain. Small mammals found on the Powell Buttes include American badger, striped skunks, western spotted skunks, common raccoons, black-tailed jackrabbits, mountain cottontails, California ground squirrels, Belding's ground squirrels, Ord's kangaroo rat, and deer mice. Larger mammals include black-tailed deer, coyotes, bobcats, and mountain lions. Reptiles found on Powell Buttes include common garter snakes, gopher snakes, and western rattlesnakes. Common lizards include short-horned lizards, western fence lizards, sagebrush lizards,