Mosaic Csa F2b

About Mosaic Csa F2b

The primary purpose of Mosaic Csa F2b 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 57 feet tall and stretches 14,500 feet across, creates a reservoir covering 650 acres, has a maximum storage capacity of 34,500 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1993, the structure is 33 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 57 feet, this dam is taller than 95% of all dams in the United States.

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