In 1933, a Civilian Conservation Corps camp was established for about 200 men who worked on additions to the trail network. After lengthy legal proceedings, the old mining claims were incorporated into the monument in 1958. CCC laborers improved the road in Bear Gulch, built tourist cabins, and constructed the dam at the Bear Gulch reservoir. A fire lookout was built by the CCC on Chalone Peak in 1935, but was destroyed by fire in 1951 and replaced by a frame structure the following year. The park's visitor center and headquarters were built in 1936–37 from local stone. A superintendent's residence was started in 1941 and completed in 1949. The Mission 66 project added lands and new projects, with an emphasis on development of the previously undeveloped west side of the park.