Stockpond Reservoir Report
Last Updated: December 8, 2025
Stockpond, located in Antelope Coal Mine, Campbell County, Wyoming, serves multiple purposes such as flood risk reduction, fire protection, and as a stock or small fish pond.
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Summary
Constructed in 2007, this earth dam stands at a height of 28 feet with a hydraulic height of 20 feet, providing a storage capacity of 165 acre-feet. With a surface area of 12 acres and a drainage area of 1 square mile, Stockpond plays a vital role in managing water resources in the region.
Managed by a private owner, Stockpond is regulated by the State of Wyoming with oversight from the State Engineer's Office and Department of Environmental Quality. The dam's condition assessment in 2017 rated it as fair with a low hazard potential. Despite its moderate risk level, Stockpond has a history of meeting inspection and enforcement requirements, ensuring its structural integrity and safety. With Liz Cheney as the Congressional Representative for the area, Stockpond remains a key asset for water storage and flood mitigation efforts in the region.
Incorporating stone core types and soil foundations, Stockpond's uncontrolled spillway and other controlled outlet gates help manage water discharge effectively. The dam's last inspection in July 2017 revealed its operational adequacy with a prescribed frequency of every 5 years. As an essential infrastructure for water management and conservation, Stockpond serves as a testament to sustainable water resource practices while addressing the challenges of climate change in Wyoming's arid landscape.
Year Completed |
2007 |
Dam Length |
1382 |
Dam Height |
28 |
River Or Stream |
NO.15 DRAW |
Primary Dam Type |
Earth |
Surface Area |
12 |
Hydraulic Height |
20 |
Drainage Area |
1 |
Nid Storage |
165 |
Structural Height |
39 |
Outlet Gates |
Other Controlled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
Seasonal Comparison
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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.
Stockpond