Rex is an earth dam located in Sevier County, Utah, built in 1948. It carries a Significant hazard potential classification.
Dam profile
NID height · 42 ft42 ft tall and 390 ft long, taller than 88% 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 Rex
The primary purpose of Rex is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Lost Creek Irrigation Company (private). It impounds the Lost Creek - Offstream near Aurora.
The dam stands 42 feet tall and stretches 390 feet across, has a maximum storage capacity of 1,100 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1948, the structure is well-established, with more than 75 years of service.
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 08/30/2023.
At 42 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Utah |
| County | Sevier |
| Nearest City | Aurora |
| River/Stream | Lost Creek - Offstream |
| Coordinates | 38.79184, -111.77575 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Length | 390 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 1,100 acre-ft |
| Max Storage | 1,100 acre-ft |
| Normal Storage | 975 acre-ft |
| Drainage Area | 5 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Lost Creek Irrigation Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 08/30/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00257 |
| Federal ID | UT00257 |
| More Info | State Dam Safety Program |