Hay Reservoir Report

Last Updated: January 7, 2026

Hay is a privately owned irrigation dam located in Sweetwater, Wyoming, along the Red Creek.


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Summary

Built in 1907, this earth dam stands at 18 feet high and stretches 950 feet in length, providing essential water storage for agricultural purposes in the area. With a storage capacity of 5,847 acre-feet, the dam serves multiple functions including irrigation, fire protection, and stock watering.

Despite its historical significance, Hay Dam is in poor condition as of the last inspection in 2017, with a low hazard potential. The dam features an uncontrolled spillway and has a moderate risk assessment rating. While it currently meets regulatory requirements, its aging infrastructure may pose challenges for long-term maintenance and operation. Climate enthusiasts and water resource experts alike can appreciate the importance of monitoring and managing the structural integrity of dams like Hay to ensure water security and environmental protection in the face of changing climate conditions.

With Liz Cheney representing Congressional District 00, Wyoming, where the dam is located, there is a shared responsibility among stakeholders to address the maintenance needs of Hay Dam. As climate change impacts water resources, the efficient and safe operation of dams becomes increasingly vital. By prioritizing proactive risk management measures and investing in infrastructure upgrades, Hay Dam can continue to support the local community's agricultural needs while safeguarding against potential hazards and ensuring sustainable water use in the region.

Year Completed

1907

Dam Length

950

Dam Height

18

River Or Stream

RED CREEK

Primary Dam Type

Earth

Surface Area

1037

Hydraulic Height

16.5

Nid Storage

5847

Structural Height

18

Hazard Potential

Low

Nid Height

18
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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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