Copco No 2 Reservoir Report

Last Updated: December 5, 2025

Copco No 2 is a privately owned hydroelectric dam located in Siskiyou, California, along the Klamath River.


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Summary

Completed in 1925, this gravity dam stands at a height of 63 feet and has a structural height of 63 feet as well. With a maximum storage capacity of 73 acre-feet and a normal storage capacity of 73 acre-feet, Copco No 2 plays a vital role in water resource management in the region.

The dam features a controlled spillway with a width of 130 feet and is equipped with Tainter and Vertical Lift outlet gates. Inspected by the Federal Energy Regulatory Commission, Copco No 2 has a low hazard potential and a risk assessment rating of Very High (1). The dam is subject to state regulation, inspection, and enforcement, with the Department of Water Resources overseeing its safety.

As a key component in the region's hydroelectric infrastructure, Copco No 2 serves as a critical source of energy production and water supply. With its historical significance and important role in water management, this dam is a focal point for water resource and climate enthusiasts interested in sustainable energy practices and environmental conservation efforts.

Year Completed

1925

Dam Length

278

Dam Height

38

River Or Stream

Klamath River

Primary Dam Type

Gravity

Surface Area

5

Hydraulic Height

27

Drainage Area

4300

Nid Storage

73

Structural Height

63

Outlet Gates

Tainter (radial) - 5, Vertical Lift - 1

Hazard Potential

Low

Foundations

Rock

Nid Height

63
       
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.