East Fork Diversion Reservoir Report

Last Updated: December 5, 2025

The East Fork Diversion, located in Boulder Town, Utah, is a key hydroelectric facility designed by Harza Engineering and completed in 1958.


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Summary

This Earth-type dam spans 630 feet in length and stands at a height of 29 feet, with a storage capacity of 40 acre-feet. The primary purpose of the dam is for hydroelectric power generation, with irrigation as a secondary purpose.

Operated by a public utility, the East Fork Diversion is regulated by the Utah Division of Water Rights and inspected regularly by the Federal Energy Regulatory Commission. With a low hazard potential and moderate risk assessment, the dam is considered to be in good condition. The surrounding area, including the East Fork Boulder Creek, benefits from the controlled discharge of up to 4000 cubic feet per second and a surface area of 2.2 acres.

For water resource and climate enthusiasts, the East Fork Diversion serves as a noteworthy example of sustainable water management and renewable energy production. By harnessing the power of East Fork Boulder Creek, this dam contributes to the local economy while mitigating risks associated with flooding and drought. With its impressive engineering and regulatory oversight, the East Fork Diversion stands as a vital component of Utah's water infrastructure and a model for responsible hydroelectric development.

Year Completed

1958

Dam Length

630

Dam Height

29

River Or Stream

East Fork Boulder Creek

Primary Dam Type

Earth

Surface Area

2.2

Drainage Area

22

Nid Storage

40

Structural Height

24

Hazard Potential

Low

Nid Height

29
       
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.