1958 Over 50,000 acres were declared excess and turned over to the Bureau of Land Management (BLM), U.S. Department of Interior (DOI), or Mineral County.

Prior to 1977 The Depot was a Naval Ammunition Depot. During that time, mustard and CG chemicals munitions were disposed of onsite.

1977 Hawthorne Army Depot consists of 148,517 acres; however, at one time it included an area of approximately 200,000 acres.

1994 The mission of the plant is to be responsible for receiving, renovating, maintaining, storing, and issuing of ammunition, explosives, expendable ordnance items, and weapons and technical ordnance materiel. HWAD also tests weapons and performs demilitarization of munitions through the western area demilitarization facility. The installation has several sites which may contain buried munitions or chemical agent: Mustard Gas Disposal Area (HWAD-5), Old Bomb Disposal Area No. 5 (HWAD-A6e), Magazine 18 AT5 Disposal Pit (HWAD-A11), Resource Recovery Recycle (M687 R3), and the Property Reutlization Office. These areas have been used at various times since the installation was commissioned and some are still in use. The depot complex has a total of 2,617 structures, of which 2,229 are explosive magazines with a maximum storage capacity of 600,000 tons. The depot also has a 700-acre bomb disposal range. "