An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Optimization Review: Carson River Mercury Superfund Site, Carson City, Nevada

The Carson River Mercury Site (CRMS) (Figure 1) is located in northwest Nevada and was designated a Superfund site in 1990 because of elevated mercury concentrations observed in surface water, sediments and biota inhabiting the site. The CRMS encompasses the 80-mile Carson River System (CRS) downstream of Carson City, numerous historical mill tailings sites along the Carson River and foothill tributaries, the Lahontan Reservoir constructed approximately 30 miles downstream from Carson City, and the lake, wetland and canal complex downstream from the reservoir. The mill sites used mercury to extract gold and silver from the ore obtained by Comstock Lode mining operations.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.