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.