Cabinet Gorge Reservoir Report

Last Updated: December 5, 2025

Cabinet Gorge, a private hydroelectric facility located in Bonner, Idaho, harnesses the power of the Clark Fork river to generate electricity.


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Summary

Constructed in 1952, this impressive arch dam stands at a height of 166 feet, with a hydraulic height of 170 feet and a structural height of 177 feet. With a storage capacity of 104,600 acre-feet and a maximum discharge of 260,000 cubic feet per second, Cabinet Gorge plays a vital role in providing renewable energy to the region.

Managed by the Federal Energy Regulatory Commission, Cabinet Gorge not only serves as a source of hydroelectric power but also supports fish and wildlife habitats and recreational activities. The dam's spillway, with a width of 330 feet, helps regulate water flow during peak periods. Despite a high hazard potential, the dam's condition assessment is not currently available, highlighting the importance of regular inspections and emergency preparedness measures.

With its significant impact on water resources and climate in the area, Cabinet Gorge remains a critical infrastructure for sustainable energy production and environmental conservation. As enthusiasts of water resource management and climate resilience, the intricate design and operation of this multi-arch dam serve as a fascinating example of balancing energy needs with environmental stewardship in the modern era.

Year Completed

1952

Dam Length

600

Dam Height

166

River Or Stream

Clark Fork

Primary Dam Type

Arch

Surface Area

3203

Hydraulic Height

170

Drainage Area

22073

Nid Storage

104600

Structural Height

177

Outlet Gates

Slide (sluice gate) - 10

Hazard Potential

High

Foundations

Rock

Nid Height

177
       
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.