Patra No. 3 Reservoir Report
Nearby: Stone No. 2 Flat
Last Updated: December 8, 2025
Patra No.
°F
°F
mph
Wind
%
Humidity
Summary
3, located in HULETT, Wyoming, along the S PRONG CABALLO river, is a private earth dam completed in 1925 for fire protection, stock, and small fish pond purposes. The dam stands at 24 feet high with a hydraulic height of 20 feet and a length of 1092 feet, providing a storage capacity of 291 acre-feet. Despite its low hazard potential, the dam's condition assessment in 2018 reported a poor rating, indicating potential concerns for its structural integrity.
The dam features an uncontrolled spillway with a width of 185 feet and no outlet gates. While it has a moderate risk rating, with a risk assessment score of 3, the dam is not regulated by federal agencies but falls under Wyoming's state jurisdiction, with permitting, inspection, and enforcement conducted by the State Engineer's Office. The last inspection in 2018 revealed the dam's poor condition, raising concerns about its long-term sustainability and the need for potential risk management measures to ensure the safety of the surrounding community and environment.
Year Completed |
1925 |
Dam Length |
1092 |
Dam Height |
24 |
River Or Stream |
S PRONG CABALLO |
Primary Dam Type |
Earth |
Surface Area |
30 |
Hydraulic Height |
20 |
Nid Storage |
291 |
Structural Height |
24 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
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.
Patra No. 3