Greystone Tails Dam Reservoir Report
Last Updated: December 13, 2025
Greystone Tails Dam, located in Lander County, Nevada, is a privately owned earth dam primarily used for tailings storage.
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Summary
Built in 1954, this dam stands at a height of 148 feet with a length of 1010 feet, providing storage for up to 906 acre-feet of water. Despite being categorized as having low hazard potential, the dam is subject to regular state inspections, with the last assessment conducted in June 2019, reporting a fair condition.
The dam, situated on Cooks Creek, is managed by the Nevada Division of Water Resources and falls under state jurisdiction and regulation. While it does not have a spillway, it boasts a hydraulic height of 103 feet and a maximum discharge rate of 5 cubic feet per second. Although the risk assessment ranks it as high, with a risk management plan yet to be specified, the dam continues to serve its purpose effectively while being monitored for any necessary structural improvements. For water resource and climate enthusiasts, Greystone Tails Dam presents an intriguing case study of private dam ownership and state oversight in maintaining water infrastructure.
Years Modified |
2001 - Structural |
Year Completed |
1954 |
Dam Length |
1010 |
Dam Height |
111 |
River Or Stream |
COOKS CREEK-TR |
Primary Dam Type |
Earth |
Surface Area |
25.2 |
Hydraulic Height |
103 |
Drainage Area |
0.4 |
Nid Storage |
906 |
Structural Height |
148 |
Outlet Gates |
None - 0 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
148 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Greystone Tails Dam