Lewis and Clark Station

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Snapshot

Lewis and Clark Station has 9 groundwater monitoring wells, 7 of which have been polluted above federal advisory levels based on samples collected between March 30, 2016 and October 03, 2017. Groundwater at this site contains unsafe levels of sulfate, selenium, boron, molybdenum, lithium, cobalt, fluoride and radium.

Site description

Montana-Dakota Utilities’ Lewis & Clark Station is located in Richland County, along the banks of the Yellowstone River. Plant Lewis and Clark is began operations in 1958 with a singular, coal-fired unit still in operation today. The 88-MW unit is scheduled to be retired and replaced by a gas fired generator by 2020. This station utilizes a Scrubber Pond and Temporary Storage Area for its coal ash residuals, which are regulated under the CCR rule. You can find the industry reported data here.

For more information on Lewis & Clark Station, see EIP’s 2019 National Coal Ash Report, Coal’s Poisonous Legacy .

Monitoring Wells Wells reporting one or more exceedances for at least one pollutant.
7 / 9
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One or more exeedances
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Well "halo" size corresponds to mean concentration. Please note that some wells may not be visible on the map due to overlapping locations.
Pollutants monitored and above guidelines
Tip: Click on a contaminant to view wells that have recorded exceedances. Click again to remove the filter. boron cobalt fluoride lithium molybdenum radium selenium sulfate
Pollutants monitored and below guidelines
antimony arsenic barium beryllium cadmium chromium lead mercury thallium
Pollutants not monitored
ammonia, copper, cyanide, gross alpha particle, gross beta particle, hexavalent chromium, manganese, nickel, nitrate, nitrite, silver, strontium, tritium, uranium

Facility last updated on Tuesday, July 23, 2019 10:51:13 AM EDT