Greystone Tails Dam
Greystone Tails Dam is an earth dam located in Lander County, Nevada, built in 1954. It carries a Low hazard potential classification and has a fair condition assessment.
About Greystone Tails Dam
The primary purpose of Greystone Tails Dam 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 M-i Llc (private). It impounds the Cooks Creek-tr.
The dam stands 148 feet tall and stretches 1,010 feet across, creates a reservoir covering 25 acres, has a maximum storage capacity of 906 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1954, the structure is well into its service life at over 50 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 06/05/2019.
At 148 feet, this dam is taller than 99% of all dams in the United States.
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Location
| State | Nevada |
| County | Lander |
| Nearest City | None |
| River/Stream | Cooks Creek-tr |
| Coordinates | 40.26094, -116.87190 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 148 ft |
| Dam Height | 111 ft |
| Dam Length | 1,010 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 906 acre-ft |
| Max Storage | 906 acre-ft |
| Normal Storage | 600 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 5 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Tailings |
| Owner | M-I LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/05/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NV10620 |
| Federal ID | NV10620 |
| More Info | State Dam Safety Program |