Dejarnatt Reservoir Report

Last Updated: December 24, 2025

Dejarnatt is a privately owned dam located in Box Elder, Utah, specifically in the city of Howell.


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Summary

Built in 1967 by the USDA NRCS, this earth dam stands at a structural height of 43 feet and has a hydraulic height of 37 feet. Its primary purpose is flood risk reduction, serving the Blue Creek and covering a drainage area of 73 square miles. With a storage capacity of 1350 acre-feet, Dejarnatt plays a significant role in managing water resources in the region.

Managed by the Utah Division of Water Rights, Dejarnatt is subject to state regulations, inspections, and enforcement to ensure its safety and functionality. The dam has a hazard potential rated as significant, highlighting the importance of regular inspections and maintenance. Despite not having a condition assessment, Dejarnatt is a vital infrastructure for flood control and water management in the area. Its location, design, and purpose make it a key asset for climate resilience and water resource conservation efforts in Utah.

As a part of the flood risk reduction system, Dejarnatt contributes to the overall water management strategy in Box Elder County. With its close proximity to the Blue Creek and a storage capacity of 1350 acre-feet, the dam plays a crucial role in mitigating flood risks and ensuring water availability in the region. Upheld by the Natural Resources Conservation Service and regulated by state authorities, Dejarnatt stands as a testament to the collaborative efforts in safeguarding water resources and adapting to changing climate conditions.

Year Completed

1967

Dam Length

1389

River Or Stream

BLUE CREEK

Primary Dam Type

Earth

Hydraulic Height

37

Drainage Area

73

Nid Storage

1350

Structural Height

43

Hazard Potential

Significant

Nid Height

43
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.