Betty Reservoir Report
Last Updated: December 5, 2025
Betty, located in Hulett, Wyoming, is a privately owned Earth dam completed in 1957 for fire protection, stock, or small fish pond purposes.
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Summary
The dam stands at a height of 31 feet with a hydraulic height of 26 feet and a length of 528 feet, creating a reservoir with a normal storage capacity of 93 acre-feet. Situated on Johnson Creek, Betty has a low hazard potential and is classified as being in fair condition as of the last inspection in May 2021.
Despite its modest size, Betty plays a crucial role in the local water resource management system, providing essential services for fire protection and livestock watering. With its uncontrolled spillway and moderate risk assessment, the dam serves as a valuable asset for the community while also presenting manageable challenges for regulatory agencies like the Wyoming State Engineer's Office. Water resource and climate enthusiasts can appreciate Betty's contribution to the regional ecosystem and the careful balance between human needs and environmental stewardship that it represents.
Year Completed |
1957 |
Dam Length |
528 |
Dam Height |
31 |
River Or Stream |
JOHNSON CREEK |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
26 |
Nid Storage |
154 |
Structural Height |
31 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
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.
Betty