Conesville Plant Ash Pond Complex

About Conesville Plant Ash Pond Complex

The primary purpose of Conesville Plant Ash Pond Complex is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by Conesville Industrial Park, Llc (public utility). It impounds the Offstream near Conesville.

The dam stands 35 feet tall and stretches 9,850 feet across, creates a reservoir covering 82 acres, has a maximum storage capacity of 2,518 acre-feet, and collects water from a drainage area of 0 square miles.

This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 12/12/2023.

At 35 feet, this dam is taller than 82% of dams nationwide.

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