Annabella East Detention Basin Reservoir Report
Last Updated: December 5, 2025
Annabella East Detention Basin is a vital flood risk reduction infrastructure located in Annabella, Utah.
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Summary
Completed in 2017 by designers Jones and DeMille, this earth dam structure stands at an impressive 34.9 feet in structural height, with a hydraulic height of 17.3 feet. It serves as a crucial defense against potential flooding in the area, with a storage capacity of 34.9 acre-feet and a drainage area of 2.9 square miles.
Managed by the Utah Division of Water Rights, Annabella East Detention Basin is regulated and inspected regularly to ensure its operational readiness. The dam is classified as having a significant hazard potential, highlighting its importance in mitigating flood risks for the local community. With its primary purpose being flood risk reduction, this infrastructure plays a crucial role in protecting the residents of Annabella and the surrounding area from potential water-related disasters.
As a key component of flood control efforts in Sevier County, Utah, Annabella East Detention Basin stands as a testament to proactive water resource management. With its strategic location and impressive specifications, this infrastructure serves as a critical safeguard against the devastating impacts of flooding, showcasing the importance of sustainable water resource management practices in combating the challenges posed by climate change.
Year Completed |
2017 |
Primary Dam Type |
Earth |
Hydraulic Height |
17.3 |
Drainage Area |
2.9 |
Nid Storage |
34.9 |
Structural Height |
34.9 |
Hazard Potential |
Significant |
Nid Height |
35 |
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.
Annabella East Detention Basin