No. 3 Tailings
No. 3 Tailings is an earth dam located in Sweetwater County, Wyoming, built in 1980. It carries a Low hazard potential classification and has a fair condition assessment.
About No. 3 Tailings
The primary purpose of No. 3 Tailings 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 Left Fork Stevens Draw near Green River.
The dam stands 23 feet tall and stretches 650 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 140 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1980, the structure is 46 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 06/04/2020.
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Location
| State | Wyoming |
| County | Sweetwater |
| Nearest City | Green River |
| River/Stream | Left Fork Stevens Draw |
| Coordinates | 41.72510, -109.68220 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 19 ft |
| Dam Length | 650 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 140 acre-ft |
| Max Storage | 140 acre-ft |
| Normal Storage | 137 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 5 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Tailings |
| Owner | CINER WYOMING LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/04/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01904 |
| Federal ID | WY01904 |
| More Info | State Dam Safety Program |