Mosaic Csa F2a

About Mosaic Csa F2a

The primary purpose of Mosaic Csa F2a 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 The Mosaic Company (private). It impounds the Alderman Creek near Fort Lonesome.

The dam stands 42 feet tall and stretches 12,500 feet across, creates a reservoir covering 650 acres, has a maximum storage capacity of 33,100 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1986, the structure is 40 years old.

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. An emergency action plan is in place for this dam. The most recent inspection on record was 07/20/2005. That was over 20 years ago.

At 42 feet, this dam is taller than 89% of dams nationwide.

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