Hanna Pilot Reservoir Reservoir Report
Nearby: Chace No. 1 Hanna Lagoon (Cell 1 & 2)
Last Updated: December 5, 2025
Hanna Pilot Reservoir, located in Carbon County, Wyoming, is a privately owned earth dam structure designed by Wright Water Engineers and completed in 2001.
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Summary
The reservoir serves as a vital water resource for the surrounding area, with a storage capacity of 755 acre-feet and a surface area of 46.35 acres. It is situated along Hanna Draw and is regulated by the State of Wyoming through the State Engineer's Office.
With a low hazard potential and satisfactory condition assessment, Hanna Pilot Reservoir is considered a reliable water storage facility. Despite its small drainage area of 0.18 square miles, the reservoir plays a crucial role in mitigating the impact of climate variability in the region. The absence of a spillway and outlet gates indicates a simple yet effective design that has stood the test of time.
As water resource and climate enthusiasts, the data on Hanna Pilot Reservoir presents an intriguing case study in sustainable water management. Its high risk assessment score highlights the importance of ongoing monitoring and maintenance to ensure the continued safety and effectiveness of the dam structure. With its strategic location and significant storage capacity, the reservoir remains a valuable asset for both water supply and environmental resilience in the area.
Year Completed |
2001 |
Dam Length |
1077 |
Dam Height |
22 |
River Or Stream |
HANNA DRAW |
Primary Dam Type |
Earth |
Surface Area |
46.35 |
Hydraulic Height |
22 |
Drainage Area |
0.18 |
Nid Storage |
755 |
Structural Height |
27 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
27 |
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.
Hanna Pilot Reservoir