From the record
“The El Caso Lookout Complex is located in the Gila National Forest north of Apache Creek, New Mexico. Built in 1934 by the Works Progress Administration, the complex was one of three New Deal-era forest fire lookouts built in Catron County.”
Wikipedia article El Caso Lookout Complex, CC BY-SA 4.0.
One of 7 National Register listings published here for Catron County · listed in 1988 · category: Structure · built in 1934.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service