Summary
Built in 1931 by the Bureau of Indian Affairs, this Earth-type structure stands at a structural height of 45 feet and has a length of 1150 feet. With a storage capacity of 20,000 acre-feet, Four Horns serves as a vital water resource for the area, primarily used for irrigation purposes.
Despite its importance, Four Horns poses a high hazard potential, with a very high risk assessment rating. The dam has not been inspected since 2012, and its condition assessment is listed as "Not Available." Emergency action plans and risk management measures are also lacking, raising concerns about the safety and resilience of this critical infrastructure in the face of potential climate-related challenges.
Given its significance as a water source for irrigation in the region, stakeholders and policymakers may need to prioritize updates and improvements to ensure the safety and efficiency of Four Horns. Increased monitoring, inspection, and maintenance efforts, along with the development of emergency preparedness plans, are essential steps to safeguard this essential water resource in the face of evolving climate conditions.
Year Completed |
1931 |
Dam Length |
1150 |
River Or Stream |
BLACKTAIL CREEK -TR |
Primary Dam Type |
Earth |
Nid Storage |
20000 |
Structural Height |
45 |
Hazard Potential |
High |
Nid Height |
45 |
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.
Four Horns