The U.S Army operated the LHAAP from World War II until the mid-1990s, manufacturing flares, TNT and other ordnances. In 1988, the first destruction on American soil of U.S. Pershing missiles occured at the site, oberved by U.S. and Soviet officials. At the height of operations, the plant employed nearly 3,000 personnel. The plant was officially deactivated in 1995.
In 1990, the LHAAP was added to the list of “Superfund” sites because of contamination of the surface areas and groundwater that resulted from its operations. Since then, the Army has worked with U.S. Environmental Protection Agency (EPA), Texas Commission on Environmental Quality (TCEQ), the U.S. Fish and Wildlife Service (FWS), and the local communities on the clean-up. The major issues that remain involve contamination of the groundwater.
Following its decision to close the plant in the 1990s, the Army agreed to transfer its LHAAP lands to the FWS for a wildlife refuge. To date, about 7,200 of the 8,400 acres at the site have been transferred to FWS for management as the Caddo Lake National Wildlife Refuge. There remain areas of ground water contamination on some of the other 1,200 acres.
The Texas Historical Commission dedicated an historical marker on the property on September 25, 2010.