Green Bay Gypstack Cell 1

About Green Bay Gypstack Cell 1

The primary purpose of Green Bay Gypstack Cell 1 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 Six Mile Creek near Mulberry.

The dam stands 85 feet tall and stretches 11,000 feet across, creates a reservoir covering 250 acres, has a maximum storage capacity of 2,072 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1965, the structure is well into its service life at over 50 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 09/07/2005. That was over 20 years ago.

At 85 feet, this dam is taller than 97% of all dams in the United States.

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