Annabella West Detention Basin Reservoir Report
Last Updated: December 5, 2025
Annabella West Detention Basin, located in Annabella, Utah, is a vital water resource infrastructure designed by Jones & DeMille to address the state's regulatory needs for water management.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 2017, this earth dam stands at a structural height of 21 feet with a hydraulic height of 16 feet, providing a maximum storage capacity of 53.7 acre-feet. The basin serves a drainage area of 6 square miles and is regulated by the Utah Division of Water Rights, ensuring proper inspection, permitting, and enforcement.
With a significant hazard potential and a recommended inspection frequency of every 3 years, Annabella West Detention Basin plays a crucial role in mitigating flood risks and managing water flow in the region. Despite not being rated for its condition assessment, the basin remains a key asset for local government water management efforts in Sevier County, Utah. As a part of the Los Angeles District, the basin serves as a testament to the collaborative efforts between federal and local agencies in safeguarding water resources and infrastructure in the face of climate challenges.
Year Completed |
2017 |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Drainage Area |
6 |
Nid Storage |
53.7 |
Structural Height |
21 |
Hazard Potential |
Significant |
Nid Height |
21 |
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 West Detention Basin