Hannah Reservoir Report
Nearby: Enl. Ellie Enlargement Of The Cori
Last Updated: December 9, 2025
Hannah, a privately-owned irrigation dam located in Campbell, Wyoming, serves multiple purposes including fire protection, stock, small fish ponds, and irrigation.
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Summary
Built in 2007, this earth dam stands at a height of 30 feet with a hydraulic height of 25 feet and a structural height of 40 feet. With a storage capacity of 142 acre-feet and a surface area of 9.25 acres, Hannah plays a crucial role in water resource management in the region.
Situated on Burnt Station Draw, Hannah has a low hazard potential and is deemed to be in fair condition as of the last assessment in September 2018. The dam features an uncontrolled spillway with a width of 30 feet and an outlet gate consisting of a single valve. Although the risk assessment indicates a moderate level of risk, the dam has not yet had an Emergency Action Plan (EAP) prepared or updated, raising concerns about emergency preparedness in the event of a breach or failure.
Managed by the private owner and designed by Hugh Lowham, Hannah undergoes inspections every 5 years to ensure its continued safety and functionality. With Liz Cheney representing the Congressional District in which it is located, this crucial water infrastructure serves as a vital component of the local water supply system, highlighting the intersection of water resources, climate, and infrastructure management in the region.
Year Completed |
2007 |
Dam Length |
850 |
Dam Height |
30 |
River Or Stream |
BURNT STATION DRAW |
Primary Dam Type |
Earth |
Surface Area |
9.25 |
Hydraulic Height |
25 |
Drainage Area |
0.1 |
Nid Storage |
142 |
Structural Height |
40 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
40 |
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.
Hannah