Powers Stock Reservoir Report
Nearby: Isom Paterson Lake
Last Updated: December 5, 2025
Powers Stock, located in Granger, Wyoming, is a privately owned dam constructed in 1965 by designer Henry N Carlton for fire protection, stock, and small fish pond purposes.
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Summary
The earth dam stands at a height of 12 feet with a hydraulic height of 9 feet and a structural height of 11 feet, spanning a length of 825 feet. Despite its low hazard potential, the dam's condition assessment is poor, as of the last inspection in September 2019, and it is considered to have a moderate risk level.
The dam has a storage capacity of 206 acre-feet, with a normal storage level of 102 acre-feet and a surface area of 42 acres. It spans the Black Rock Draw river/stream and is regulated by the state of Wyoming through the SEO agency, with permitting, inspection, and enforcement measures in place. The dam features an uncontrolled spillway with a width of 900 feet and is equipped with a slide (sluice gate) outlet gate for water release. While the dam presents a moderate risk, its associated structures are minimal, and it has not undergone significant modifications in recent years.
Powers Stock dam serves as a vital resource for fire protection and water storage in the Uinta County area. With its location in a region prone to climate variability and water scarcity, the dam plays a crucial role in safeguarding water resources for agricultural, stock, and recreational purposes. Efforts to improve the dam's condition assessment and risk management measures are essential to ensure its long-term functionality and sustainability in mitigating potential hazards and supporting the community's water needs.
Year Completed |
1965 |
Dam Length |
825 |
Dam Height |
12 |
River Or Stream |
BLACK ROCK DRAW |
Primary Dam Type |
Earth |
Surface Area |
42 |
Hydraulic Height |
9 |
Nid Storage |
206 |
Structural Height |
11 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
12 |
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.
Powers Stock