Iron Gate Reservoir Report

Last Updated: December 5, 2025

Iron Gate is a privately owned dam located on the Klamath River in Siskiyou County, California.


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Summary

Constructed in 1962, this Earth-type dam stands at a height of 173 feet, with a structural height of 189 feet. It serves multiple purposes, including hydroelectric power generation, recreation, and other uses, with a normal storage capacity of 19,000 acre-feet and a maximum storage capacity of 58,000 acre-feet.

Managed by the Federal Energy Regulatory Commission (FERC), Iron Gate has a spillway width of 727 feet and a maximum discharge capacity of 72,000 cubic feet per second. The dam has a high hazard potential and is under state regulatory oversight for inspection, permitting, and enforcement. While the condition assessment is not currently available, the Emergency Action Plan (EAP) was last revised in December 2020, reflecting moderate risk management measures in place.

Water resource and climate enthusiasts will find Iron Gate an intriguing structure due to its significant role in water management and power generation along the Klamath River. The dam's historical significance, engineering design, and impact on the surrounding environment make it a focal point for those interested in sustainable water resource management and the intersection of infrastructure with natural ecosystems. Its location in a picturesque setting adds to the appeal for visitors seeking recreational opportunities in the area.

Year Completed

1962

Dam Length

740

Dam Height

173

River Or Stream

Klamath River

Primary Dam Type

Earth

Surface Area

580

Hydraulic Height

163

Drainage Area

4360

Nid Storage

58000

Structural Height

189

Hazard Potential

High

Foundations

Rock

Nid Height

189
       
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.