The US Department of Energy has released data from sampling the agency did at the Riverton Uranium Mill Tailings Radiation Control Act Site in August. The area, which is on the Wind River Indian Reservation, was contaminated with uranium and vanadium in the late 1950s  and early 1960s, when a uranium mill processed ore there. In the ‘90s the DOE recommended waiting for natural dissolution to clean the site, and levels of contamination seemed to be diminishing predictably until a big flood in 2010.

The U.S. Department of Energy will run additional groundwater tests at a Riverton site contaminated with uranium. The Uranium Mill Tailings Radiation Control Act site was contaminated after hosting a uranium mill there in the 1960’s.