Electra Diversion Reservoir Report

Last Updated: December 5, 2025

Electra Diversion, located in Amador, California, is a private hydroelectric dam on the North Fork Mokelumne River.


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Summary

The dam is primarily used for hydroelectric power generation and stands at a height of 45 feet with a length of 188 feet. With a storage capacity of 35.5 acre-feet, the dam serves as a vital resource for water management in the region.

Managed by the Federal Energy Regulatory Commission, Electra Diversion boasts a low hazard potential and has a moderate risk assessment rating. The dam features an uncontrolled spillway with a width of 100 feet, ensuring the safe release of excess water during periods of high flow. The last inspection of the dam took place in June 2017, with regular inspections and enforcement measures in place to maintain its structural integrity and safety.

For water resource and climate enthusiasts, Electra Diversion is a noteworthy structure that plays a crucial role in the hydroelectric power generation and water management of the region. With its strategic location on the North Fork Mokelumne River and state-regulated status, this concrete gravity dam serves as a key component of the local water infrastructure, providing both energy and environmental benefits to the surrounding area.

Dam Length

188

Dam Height

45

River Or Stream

North Fork Mokelumne River

Primary Dam Type

Concrete

Surface Area

7

Drainage Area

7

Nid Storage

35.5

Hazard Potential

Low

Nid Height

45
       
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.