Summary
With a hydraulic height of 28 feet and a structural height of 29 feet, the dam has a storage capacity of 765 acre-feet, with a normal storage level of 610 acre-feet. The dam spans 2008 feet in length and covers a surface area of 108 acres, protecting the surrounding area from debris flow and potential flooding.
Managed by the Bureau of Land Management, Antelope Detention Dam boasts a low hazard potential and fair condition assessment, making it a reliable structure for mitigating risks associated with debris flow. The dam operates with an uncontrolled spillway type and has a maximum discharge capacity of 2133 cubic feet per second. Despite its relatively low risk profile, the dam undergoes inspections every 5 years to ensure its continued functionality and safety for the community of Saint George, Utah, located just 48 miles away.
While Antelope Detention Dam has not been modified since its completion, it serves as a crucial infrastructure for the region, offering protection against potential debris flow events. With its moderate risk assessment and effective risk management measures in place, the dam continues to play a vital role in safeguarding the area and its residents from the impacts of extreme weather events and climate variability.
Year Completed |
1965 |
Dam Length |
2008 |
River Or Stream |
CLAYHOLE WASH |
Primary Dam Type |
Gravity |
Surface Area |
108 |
Hydraulic Height |
28 |
Drainage Area |
25.7 |
Nid Storage |
765 |
Structural Height |
29 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
29 |
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.
Antelope Detention Dam