Initial Point of the Gila and Salt River Base Line and Meridian

Summit of Monument Hill at 115th Ave. and Baseline Rd., Avondale, Arizona. County/parish: Maricopa.

Added to the National Register of Historic Places October 15, 2002. NRIS 02001137.

1 contributing site.

National Park Service documentation: https://catalog.archives.gov/id/75610228