Near Oak Ridge in Roane County, Tennessee — The American South (East South Central)
The Wheat Colony
Keeping the Lines Ready
The gas processed at K-25, uranium hexafluoride (UFG), is highly corrosive and reactive creating challenges to the enrichment process. Due to this corrosivity, all large equipment and piping were constructed of or plated with nickel, a nonreactive metal, and smaller ones constructed of copper or nickel-copper alloy. Workers cleaned and conditioned every pipe, valve, pump, and converter using solvent degreasing, alkaline cleaning, acid pickling, scratch brushing, and surface passivation; this eliminated any contamination. When finished, the parts were sealed until they could be installed within K-25.
The Wheat Colony construction camp, and the other housing in Happy Valley, was removed by 1947. K-1401, the Conditioning Building, would continue to operate throughout the Cold War and was demolished in 2008.
[Caption]:
Workers at the K-25 Complex installing equipment within a position pressure balloon to prevent contamination.
Erected by Manhattan Project National Historical Park, National Park Service, Department of the Interior.
Topics. This historical marker is listed in these topic lists: Notable Places • War, World II. A significant historical year for this entry is 1943.
Location. 35° 55.395′ N, 84° 23.486′ W. Marker is near Oak Ridge, Tennessee, in Roane County. It can be reached from Tennessee 58 north of Perimeter Road, on the right when traveling north. Touch for map. Marker is at or near this postal address: 2013 TN-58, Kingston TN 37763, United States of America. Touch for directions.
Regionally, this marker is in East Tennessee and in Greater Knoxville. It is also in the American South, specifically in the Upper South, in Appalachia, and specifically in Southern Appalachia. Globally, it is in North America,
the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once the original Cherokee Nation, the territory of the Mississippian Culture, one of the Confederate States of America, and the Antebellum South.
Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies: Happy Valley (here, next to this marker); K-25 Plant (a few steps from this marker); To Have a Job (a few steps from this marker); S-50 Thermal Diffusion Plant (within shouting distance of this marker); Building K-1000 (approx. 0.3 miles away); Wheat Community (approx. 0.4 miles away); BNFL, Inc. (approx. 0.6 miles away); Poplar Creek Seminary (approx. 1.4 miles away). Touch for a list and map of all markers in Oak Ridge.
Credits. This page was last revised on February 20, 2026. It was originally submitted on February 16, 2026, by Darren Jefferson Clay of Duluth, Georgia. This page has been viewed 69 times since then. Photos: 1, 2. submitted on February 16, 2026, by Darren Jefferson Clay of Duluth, Georgia. • James Hulse was the editor who published this page.

