Slide Mountain Lookout

The Angeles National Forest Fire Lookout Association (ANFFLA) is a nonprofit 501(c)(3) organization of citizen volunteers dedicated to the preservation, restoration, and operation of the fire lookout towers in the Angeles National Forest, Los Angeles County, and other Southern California areas. The organization works in partnership with the federal, state, county, and city agencies to meet these goals. The Association was founded in 1998 by Pam and George Morey and several other members as an offshoot of the San Bernardino National Forest Association.

Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).