Henrys Fork Ranch Reservoir Report

Last Updated: December 5, 2025

Located in the picturesque Fremont County, Idaho, Henrys Fork Ranch stands as a private oasis along the renowned SPRING HENRYS FORK river.


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Summary

This stunning recreational haven offers a tranquil escape for water resource and climate enthusiasts, boasting a pristine surface area of 14 acres and a drainage area of 3.9 acres. The ranch features an earth dam with a height of 23.3 feet and a controlled spillway width of 20 feet, providing a safe and enjoyable environment for outdoor activities.

Constructed in 1987, Henrys Fork Ranch has since become a beloved destination for nature lovers seeking solace in its peaceful surroundings. With a normal storage capacity of 109 acre-feet and a maximum discharge of 140 cubic feet per second, the ranch offers ample opportunities for water-based recreation. Despite a low hazard potential, the dam's fair condition assessment and very high risk assessment (rated 1 out of 10) underscore the importance of ongoing maintenance and monitoring to ensure the safety and longevity of this cherished retreat.

In the care of the Idaho Department of Water Resources, Henrys Fork Ranch remains a shining example of responsible stewardship and sustainable management. As visitors bask in the beauty of its natural surroundings and engage in recreational pursuits, the ranch continues to serve as a beacon of harmony between human enjoyment and environmental preservation in the heart of Idaho's enchanting landscape.

Year Completed

1987

Dam Length

270

Dam Height

23.3

River Or Stream

SPRING HENRYS FORK

Surface Area

14

Hydraulic Height

19.5

Drainage Area

3.9

Nid Storage

109

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

23
       
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.