Mackey Reservoir Report
Nearby: Snyder Greybull Valley (1st Enl.)
Last Updated: December 5, 2025
Mackey, a private-owned structure in Wyoming, is a vital resource for fish and wildlife conservation as it primarily serves as a fish and wildlife pond.
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Summary
Completed in the year 2000, this Earth-type dam stands at a height of 15 feet and has a storage capacity of 179 acre-feet. Located in Mackey Gulch, near the city of Unnamed Ranch, this structure covers a surface area of 19.25 acres and has a drainage area of 5 square miles.
Despite its low hazard potential and satisfactory condition assessment, Mackey Dam is regulated and inspected by the Wyoming State Engineer's Office. It features an uncontrolled spillway and other controlled outlet gates for water management. With a moderate risk rating and a 5-year inspection frequency, Mackey plays a crucial role in the irrigation, fire protection, and stock maintenance of the surrounding area. Furthermore, its strategic location within Congressional District 00, Wyoming, ensures efficient oversight and management by local authorities.
In the face of changing climate patterns and increasing water resource challenges, Mackey Dam stands as a beacon of sustainable water management and ecosystem preservation. With its focus on wildlife conservation and multiple beneficial purposes, this structure exemplifies the harmonious coexistence of human needs and environmental stewardship. As water resource and climate enthusiasts, understanding and advocating for the protection and responsible management of structures like Mackey is essential for ensuring the long-term sustainability of our natural resources.
Year Completed |
2000 |
Dam Length |
1535 |
Dam Height |
15 |
River Or Stream |
MACKEY GULCH |
Primary Dam Type |
Earth |
Surface Area |
19.25 |
Hydraulic Height |
12 |
Drainage Area |
5 |
Nid Storage |
179 |
Structural Height |
15 |
Outlet Gates |
Other Controlled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Greybull River At Meeteetse
|
338cfs |
Shoshone River Below Buffalo Bill Reservoir
|
315cfs |
Bighorn River At Basin
|
996cfs |
South Fork Shoshone River Ab Buffalo Bill Res
|
72cfs |
Shoshone River Near Lovell
|
460cfs |
Bighorn River At Kane
|
1340cfs |
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.
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