Pond 4 (dam 2b)
Pond 4 (dam 2b) is an earth dam located in Sweetwater County, Wyoming, built in 1992. It carries a Significant hazard potential classification.
About Pond 4 (dam 2b)
The primary purpose of Pond 4 (dam 2b) 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 Oci Wyoming, L.p. (private). It impounds the Stevens Draw near Green River.
The dam stands 39 feet tall and stretches 950 feet across, creates a reservoir covering 239 acres, has a 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. An emergency action plan is in place for this dam. The most recent inspection on record was 06/05/2025.
At 39 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Wyoming |
| County | Sweetwater |
| Nearest City | Green River |
| River/Stream | Stevens Draw |
| Coordinates | 41.73306, -109.66250 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 27 ft |
| Dam Length | 950 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 4,612 acre-ft |
| Normal Storage | 4,612 acre-ft |
| Surface Area | 239 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 1,850 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Tailings |
| Owner | OCI WYOMING, L.P. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Last Inspection | 06/05/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WY02047 |
| Federal ID | WY02047 |
| More Info | State Dam Safety Program |