Dejarnatt
Dejarnatt is an earth dam located in Box Elder County, Utah, built in 1967. It carries a Significant hazard potential classification.
About Dejarnatt
The primary purpose of Dejarnatt 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 Blue Creek Irrigation Company (private). It impounds the Blue Creek near Howell.
The dam stands 43 feet tall and stretches 1,389 feet across, has a maximum storage capacity of 1,350 acre-feet, and collects water from a drainage area of 73 square miles. Completed in 1967, the structure is well into its service life at over 50 years old.
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 06/16/2022.
At 43 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Utah |
| County | Box Elder |
| Nearest City | Howell |
| River/Stream | Blue Creek |
| Coordinates | 41.83547, -112.45216 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 43 ft |
| Dam Length | 1,389 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 1,350 acre-ft |
| Max Storage | 1,350 acre-ft |
| Normal Storage | 385 acre-ft |
| Drainage Area | 73 sq mi |
| Max Discharge | 72 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | BLUE CREEK IRRIGATION COMPANY |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 06/16/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00089 |
| Federal ID | UT00089 |
| More Info | State Dam Safety Program |