Swift No 2 Hydroelectric Project Reservoir Report

Last Updated: December 14, 2025

The Swift No 2 Hydroelectric Project, located in Cougar, Washington, is a remarkable feat of engineering designed by the Bechtel Corporation.


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Summary

Completed in 1959, this project harnesses the power of the Lewis River to generate hydroelectricity, providing a sustainable energy source for the region. With a dam height of 106 feet and a hydraulic height of 63 feet, the project has a structural height of 121 feet and a storage capacity of 2500 acre-feet.

Operated by a Public Utility, the Swift No 2 Hydroelectric Project is regulated by the Federal Energy Regulatory Commission, ensuring its safe and efficient operation. The project's spillway, with a width of 537 feet, helps to control water flow and prevent flooding in the surrounding area. With a low hazard potential and a moderate risk assessment rating, this hydroelectric project plays a crucial role in meeting the energy needs of the community while minimizing environmental impact.

Overall, the Swift No 2 Hydroelectric Project is a testament to the ingenuity and resourcefulness of human engineering in utilizing renewable energy sources. With a focus on sustainability and efficiency, this project serves as a model for future developments in the water resource and climate sector, showcasing the potential for environmentally-friendly energy solutions to meet growing energy demands.

Year Completed

1959

Dam Length

16700

Dam Height

106

River Or Stream

Lewis River

Primary Dam Type

Earth

Surface Area

95

Hydraulic Height

63

Nid Storage

2500

Structural Height

121

Hazard Potential

Low

Foundations

Rock

Nid Height

121
       
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.