Annabella East Detention Basin is an earth dam located in Sevier County, Utah, built in 2017. It carries a Significant hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall, taller than 80% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Annabella East Detention Basin
The primary purpose of Annabella East Detention Basin is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Annabella Town Water Department (local government).
The dam stands 35 feet tall, has a maximum storage capacity of 34 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 2017, the structure is relatively new.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 05/09/2023.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Utah |
| County | Sevier |
| Nearest City | Annabella |
| Coordinates | 38.70386, -112.04967 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Year Completed | 2017 (9 years old) |
Storage & Hydraulics
| NID Storage | 34 acre-ft |
| Max Storage | 34 acre-ft |
| Normal Storage | 17 acre-ft |
| Drainage Area | 2 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Annabella Town Water Department |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/09/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT53863 |
| Federal ID | UT53863 |
| More Info | State Dam Safety Program |