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Longhorn Army Ammunition Plant Karnack TX

by Civilian Exposure

The 8,416-acre Longhorn Army Ammunition Plant (LHAAP) installation is located between State Highway 43 and Caddo Lake in Karnack, Harrison County, Texas, approximately 14 miles northeast of Marshall, Texas, and approximately 40 miles northwest of Shreveport, Louisiana. The site is in a rural area and operated from 1942 to 1997, historically manufacturing TNT, rocket motors and various pyrotechnic items.

The site is a federal facility.  The Army is the lead agency with oversight by the EPA and State of Texas.  Remediation and monitoring activities are ongoing for multiple sites within LHAAP.  In addition, a ground water treatment plant is operated and maintained for treatment of groundwater extracted from sites LHAAP-16, -18 and -24.


Civilian Exposure Longhorn

Chemicals found:

  • TCE
  • DCE
  • Benzene
  • Arsenic
  • Barium
  • Cadmium
  • Chloride
  • Chromium
  • Iron
  • Lead
  • Nickel
  • Perchlorate


*Note – We’ve posted, verbatim, the information from the EPA on Longhorn on this page rather than simply sharing a link.  This is to maintain an ongoing record of the information to-date as of October 2015, in the event it is edited or removed from their site in the future. You can view the link to the EPA page at the bottom of this post.

For more details on Longhorn, visit this link: Longhorn Army Ammunition Plant – EPA Superfund Site


Document Link: EPA Final 5-Year Review Document (PDF)



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