Pond 4 (dam 2a)

About Pond 4 (dam 2a)

The primary purpose of Pond 4 (dam 2a) 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 Ciner Wyoming Llc (private). It impounds the Stevens Draw near Green River.

The dam stands 39 feet tall and stretches 750 feet across, creates a reservoir covering 239 acres, has a maximum storage capacity of 4,612 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1992, the structure is 34 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 06/05/2025.

At 39 feet, this dam is taller than 86% of dams nationwide.

Search for dams near your address to see all dams in your area with hazard classifications and safety data.