EPA Region 10 Lemhi County Town of Lemhi
2nd Congressional District Other Names:
Last Update: May, 2010
Site Description Threats and Contaminants
Media Affected:Groundwater, Soil & Surface Water
Surface water and sediments are contaminated with high levels of heavy metals such as copper, cobalt and arsenic. Groundwater and surface water are primarily contaminated with copper and cobalt. Sediments and soils are primarily contaminated with copper, cobalt and arsenic. Site studies have shown that acid rock drainage from tunnels and waste piles have contributed to the poor water quality of local creeks. This water quality affects local aquatic life, including the Snake River spring/summer Chinook salmon and other endangered or threatened species. People who come into direct contact with or ingest contaminated sediments or soils could be at risk.