Lewis and Clark Station

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Lewis and Clark Station has 16 groundwater monitoring wells, 13 of which have been polluted above federal advisory levels based on samples collected between March 30, 2016 and August 28, 2019. Groundwater at this site contains unsafe levels of sulfate, selenium, boron, lithium, molybdenum, cobalt, antimony, fluoride, arsenic and radium.

Site description

Montana-Dakota Utilities’ Lewis & Clark Station was in Sidney, Montana along the banks of the Yellowstone River in Richland County. Plant Lewis and Clark began operations in 1958 with one coal-fired unit, with a capacity of 50-MW, which was retired in 2021. This station had 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 about the Lewis and Clark Station, see EIP's 2019 National Coal Ash Report.

Monitoring Wells Wells reporting one or more exceedances for at least one pollutant.
13 / 16
Wells not shown Locations for the following wells are unavailable:

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No exceedances
One or more exeedances
No data available
Other designation
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. antimony arsenic boron cobalt fluoride lithium molybdenum radium selenium sulfate
Pollutants monitored and below guidelines
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 Wednesday, October 19, 2022 04:26:39 PM EDT