Rex Reservoir Report

Last Updated: December 5, 2025

Rex is a private water resource located in Aurora, Utah, managed by the Utah Division of Water Rights.


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Summary

This Earth dam, completed in 1948, serves primarily for irrigation purposes, with a storage capacity of 1100 acre-feet. The dam stands at a height of 42 feet and has a hydraulic height of 38 feet, overlooking the Lost Creek offstream.

Despite being non-federally owned, Rex is regulated by the state and undergoes regular inspections and enforcement to ensure its safety and functionality. With a significant hazard potential, the dam has a high-risk factor that necessitates proper risk management measures. While the condition of the dam is currently not rated, its inspection frequency is every two years, with the last inspection conducted in July 2019.

For water resource and climate enthusiasts, Rex presents an intriguing opportunity to explore the intersection of water infrastructure and environmental stewardship in the state of Utah. As a vital irrigation source in Sevier County, Rex symbolizes the delicate balance between human intervention and natural resources, highlighting the importance of responsible water management practices in the face of climate change and increasing water demands.

Year Completed

1948

Dam Length

390

River Or Stream

LOST CREEK - OFFSTREAM

Primary Dam Type

Earth

Hydraulic Height

38

Drainage Area

5

Nid Storage

1100

Structural Height

42

Hazard Potential

Significant

Nid Height

42
       
Seasonal Comparison

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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.