Tyson Valley Powder Farm

The Tyson Valley Powder Farm was a roughly 2,620 acre Army facility located about four miles east of Eureka in St. Louis County, Missouri. Established in the early 1940s, the site supported the St. Louis Ordnance Plant and was used primarily for the storage of small arms ammunition, with a secondary role in munitions testing and disposal. Records indicate the facility was active during World War II and again through the period that ended around 1963, when defense use of the land wound down. Wartime documents also note that radioactive materials, including uranium metal associated with the Manhattan Engineer District, were stored in concrete bunkers at the site after World War II. Today the property is divided between Washington University's Tyson Research Center and St. Louis County's Lone Elk Park, with most of the original facility no longer serving any military purpose.

Because of decades of ordnance storage, testing, and waste destruction, the property has been associated with several categories of potential contamination. State and Department of Defense records describe likely residues from the handling and disposal of munitions and related materials, and the documented concerns reflect the firing ranges, burn areas, and storage bunkers that once operated on the land.

1. RDX and other explosives: Explosive compounds such as RDX and various nitroaromatics are residues commonly linked to munitions handling, testing, and disposal. At Tyson Valley these materials are associated with the firing ranges and waste destruction areas used during ordnance operations. Exposure to certain explosive compounds in soil or water has been associated with potential health concerns, and the extent of any residual contamination has been part of the site investigation.
2. Heavy metals: Lead and other heavy metals are byproducts of small arms ammunition, firing ranges, and the destruction of ordnance materials. Concerns about potential exposure to heavy metals in soil have been noted at sites with this history, which is why characterization of the former ranges and disposal areas has been a focus of investigation.
3. Solvents: Industrial solvents, including chlorinated compounds such as TCE, were widely used for cleaning and degreasing equipment at ordnance facilities. Such solvents can persist in soil and groundwater, and exposure has been associated with a range of potential health concerns, prompting environmental sampling at former defense properties of this type.
4. Radioactive materials: Wartime records indicate that radioactive wastes, including uranium metal, were stored at the site in the years following World War II. A 1988 survey conducted by Washington University School of Medicine radiation experts reported no evidence of remaining radioactive waste or contamination at the property, though the historical storage remains documented in the site record.

The Tyson Valley Powder Farm is not listed on the National Priorities List. It is addressed as a Formerly Used Defense Site, with environmental work coordinated by the U.S. Army Corps of Engineers and overseen by the Missouri Department of Natural Resources alongside other state, local, and federal agencies. The site has been in the investigation and characterization phase, and reuse of the land for research and public recreation has been recognized publicly, including a federal facility site reuse award from the U.S. Environmental Protection Agency.

Veterans who served at or near the Tyson Valley Powder Farm may wish to stay informed as investigation and any further cleanup activities proceed. Anyone with questions about possible past exposures is encouraged to keep records of their service history and to speak with the U.S. Department of Veterans Affairs about available health resources and benefits guidance.