Edwards Air Force Base, South Base Sled Track, Edwards Air Force Base, North of Avenue B, between 100th & 140th Streets East, Lancaster, Los Angeles County, CA

Significance: The South Base Sled Track is one of four major high-speed test tracks used to develop supersonic aircraft and rocket-propelled missiles during the 1950s and 1960s. Originally constructed as a 10,000-foot-long track in 1948, the track was expanded to 20,000 feet in 1958 to accommodate testing at higher speeds. The track closed in 1963. Though the rails of the track have been removed, the foundations of the track remain, as do several support buildings and protective berms.
Survey number: HAER CA-234
Building/structure dates: 1948 Initial Construction
Building/structure dates: 1958 Subsequent Work
Building/structure dates: 1963 Subsequent Work