Opal Springs Reservoir Report

Last Updated: December 5, 2025

Opal Springs, a hydroelectric facility located in Jefferson, Oregon, is a remarkable structure designed by CH2M-Hill and completed in 1985.


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Summary

This rockfill dam stands at a height of 21 feet and spans 177 feet in length, with a primary purpose of generating hydroelectric power and supplying water. The dam has a normal storage capacity of 41 acre-feet and a maximum storage capacity of 119 acre-feet, serving as a vital resource for the surrounding area.

Operated under the jurisdiction of the Federal Energy Regulatory Commission, Opal Springs plays a crucial role in managing water resources and ensuring the safety of the Crooked River. With a low hazard potential and a moderate risk assessment, the dam is regularly inspected to maintain its structural integrity and emergency preparedness. Despite its humble size, Opal Springs serves as a testament to sustainable energy production and water management practices, making it a significant asset for both the local community and the environment.

As a key player in the region's water supply and hydroelectric power generation, Opal Springs stands as a testament to effective dam design and operation. With its unique rockfill construction and controlled spillway, the facility showcases the intersection of engineering innovation and environmental stewardship. As climate change continues to impact water resources, Opal Springs serves as a model for sustainable infrastructure that balances the needs of the community with the preservation of natural ecosystems.

Year Completed

1985

Dam Length

177

Dam Height

21

River Or Stream

Crooked River

Primary Dam Type

Rockfill

Surface Area

5

Drainage Area

3800

Nid Storage

119

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

21
       
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.