Wise Forebay Reservoir Report

Last Updated: December 5, 2025

Wise Forebay, located in Auburn, California, is a privately owned dam primarily used for hydroelectric purposes.


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Summary

Built in 1913, this earth dam stands at a height of 20 feet with a hydraulic height of 16 feet, providing a maximum storage capacity of 32 acre-feet. With a surface area of 4.4 acres and a spillway width of 130 feet, the dam has a high hazard potential and is regulated by the Federal Energy Regulatory Commission.

Despite its age, Wise Forebay has a moderate risk assessment of 3 out of 5, indicating a need for ongoing monitoring and maintenance. The dam's last inspection in May 2021 revealed that its condition assessment was not available, highlighting the importance of regular assessments to ensure the safety and reliability of the structure. While there is no state regulation or permitting for this dam, the Federal Energy Regulatory Commission oversees its operations, inspections, and emergency response protocols.

In the event of an emergency, it is crucial that Wise Forebay has an updated Emergency Action Plan (EAP) and designated emergency contacts. While there are no inundation maps prepared or risk management measures outlined, ensuring that the dam meets guidelines and regularly reviewing and updating its EAP will be essential in mitigating potential risks and safeguarding the surrounding community and environment.

Year Completed

1913

Dam Length

1741

Dam Height

20

River Or Stream

Auburn Ravine

Primary Dam Type

Earth

Surface Area

4.4

Hydraulic Height

16

Nid Storage

32

Structural Height

20

Hazard Potential

High

Nid Height

20
       
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.