Milltown Reservoir Superfund Site
Hazardous waste site in Missoula County, Montana, United States / From Wikipedia, the free encyclopedia
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The Milltown Reservoir Sediments Superfund Site is a major Superfund site in Missoula County, Montana, seven miles east of Missoula. It was added to the National Priorities List in 1983 when arsenic groundwater contamination was found in the Milltown area. The contamination resulted from a massive flood three years after its construction in 1905, which washed millions of tons of mine waste into the Clark Fork River, ultimately ending up behind the Milltown Dam.[1]
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Since 1992, the site has been a part of the Clark Fork River Superfund Complex, consisting of three major sites (the other two in Anaconda and Butte) along a 120-mile stretch of the Clark Fork River. The Complex is the largest and most expensive Superfund site in the United States.[2]