Egbert Dam Reservoir Report

Last Updated: December 5, 2025

Egbert Dam, located in Fremont, Idaho, along the Spring Creek section of Henrys Fork, serves primarily for irrigation purposes.


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Summary

Built in 1982, this earth dam with a stone core stands at a height of 15.4 feet, providing a storage capacity of 70 acre-feet. The dam spans a length of 525 feet and has a spillway width of 13 feet, allowing for a maximum discharge of 87 cubic feet per second.

Managed by a private owner, Egbert Dam is regulated by the Idaho Department of Water Resources, ensuring state oversight for its operations, inspections, and enforcement. Despite its low hazard potential and fair condition assessment, the dam has a moderate risk rating of 3, warranting attention to risk management measures. Its last inspection in July 2017 indicated compliance with safety guidelines, with an inspection frequency of 5 years.

Water resource and climate enthusiasts interested in the infrastructure of Egbert Dam will find its location in the Ashton Reservoir area intriguing. As part of the irrigation network in the region, the dam plays a crucial role in water management for agricultural activities. With its proximity to the scenic Henrys Fork, the dam also contributes to the ecological balance of the area. Overall, Egbert Dam stands as a testament to the collaboration between private ownership and state regulation in safeguarding water resources in Idaho's landscape.

Year Completed

1982

Dam Length

525

Dam Height

15.4

River Or Stream

SPRING CREEK HENRYS FORK

Surface Area

15

Hydraulic Height

11.6

Drainage Area

8.7

Nid Storage

70

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

15
       
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.