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