The Ochoco National Forest is located in the Ochoco Mountains in Central Oregon in the United States, north and east of the city of Prineville, location of the national forest headquarters. It encompasses 850,000 acres of rimrock, canyons, geologic oddities, dense pine forests, and high desert terrain, as well as the headwaters of the North Fork Crooked River. A 1993 Forest Service study estimated that the extent of old growth in the forest was 95,000 acres.