Rubicon Auxiliary Reservoir Report

Last Updated: December 4, 2025

The Rubicon Auxiliary dam, located in El Dorado County, California, is a key component of the state's water resource infrastructure.


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Summary

Built in 1963 by the renowned design firm Bechtel, this concrete gravity dam stands at a height of 13 feet and serves primarily for hydroelectric power generation. With a storage capacity of 1439 acre-feet and a maximum discharge of 13000 cubic feet per second, the dam plays a crucial role in regulating water flow from the Feather River.

Managed by the Public Utility, the Rubicon Auxiliary dam is subject to extensive state regulation and inspection to ensure its structural integrity and safe operation. The dam's low hazard potential and moderate risk assessment underscore the importance of ongoing monitoring and maintenance efforts. In addition to its primary function of hydroelectric power generation, the dam also provides recreational opportunities for the surrounding area, making it a valuable asset for both water resource management and local community engagement.

As a part of the Federal Energy Regulatory Commission's jurisdiction, the Rubicon Auxiliary dam symbolizes the intersection of federal oversight and state-level cooperation in ensuring the safety and sustainability of water resources in California. With its strategic location in Folsom and proximity to the city's infrastructure, the dam serves as a critical piece of the region's water management system. Its historical significance, modern design, and multi-purpose utility make the Rubicon Auxiliary dam a fascinating subject for water resource and climate enthusiasts alike.

Year Completed

1963

Dam Length

522

Dam Height

13

River Or Stream

Feather River

Primary Dam Type

Concrete

Surface Area

108

Hydraulic Height

12.5

Nid Storage

1439

Structural Height

12.5

Hazard Potential

Low

Nid Height

13
       
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.