Big Hollow No.2 South Reservoir Report

Last Updated: December 5, 2025

Big Hollow No.2 South is a privately owned dam located in Utah, designed for fire protection, stock, and small fish pond purposes.


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Summary

The dam, primarily regulated by the Utah Division of Water Rights, has a hydraulic height of 15 feet and a structural height of 20 feet, with a length of 300 feet. It has a normal storage capacity of 36.45 acre-feet and is considered to have a significant hazard potential.

Although the dam's condition assessment is currently not rated, it undergoes inspections every two years, with the last inspection conducted in September 2020. The dam is situated in a region with a drainage area of zero, highlighting its importance for local water resource management. Despite lacking certain risk management measures and emergency preparedness plans, the Big Hollow No.2 South dam serves as a crucial infrastructure for maintaining water resources in the area, particularly for fire protection and agricultural needs.

Dam Length

300

Primary Dam Type

Earth

Hydraulic Height

15

Nid Storage

36.45

Structural Height

20

Hazard Potential

Significant

Nid Height

20
       
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.