Hays Reservoir Report
Last Updated: December 5, 2025
Located in Fremont, Wyoming, the Hays dam serves as a crucial infrastructure for irrigation purposes in the region.
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Summary
Built in 1918, this earth dam stands at a height of 20 feet and has a storage capacity of 557 acre-feet, with a normal storage of 418 acre-feet. The dam's primary source agency is in Wyoming, and it is regulated and inspected by the State of Wyoming.
Despite its historical significance, the Hays dam is in poor condition according to a 2019 assessment, and its hazard potential is rated as low. The spillway type is uncontrolled with a width of 12 feet, and there is one outlet gate in place. Although the risk assessment for this dam is moderate, there are no specific risk management measures mentioned in the data. It is crucial for water resource and climate enthusiasts to monitor the maintenance and upkeep of the Hays dam to ensure its continued functionality and safety for irrigation purposes in the region.
Year Completed |
1918 |
Dam Length |
793 |
Dam Height |
20 |
River Or Stream |
DRY CREEK-OFF CHANNEL |
Primary Dam Type |
Earth |
Surface Area |
50 |
Hydraulic Height |
15 |
Nid Storage |
557 |
Structural Height |
20 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wind River Near Crowheart
|
1630cfs |
Bull Lake Creek Near Lenore
|
831cfs |
Bull Lake Creek Above Bull Lake
|
47cfs |
Wind River Near Kinnear
|
346cfs |
Sf L Wind Riv Ab Washakie Res
|
15cfs |
Dinwoody Creek Above Lakes
|
74cfs |
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.
Hays