Big Creek Dam No. 6 Reservoir Report

Last Updated: December 5, 2025

Big Creek Dam No.


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Summary

6, located in Madera, California, is a privately owned concrete dam completed in 1923 by Southern California Edison Co. This hydroelectric dam stands at a height of 155 feet and has a storage capacity of 1,726 acre-feet, with a normal storage level of 993 acre-feet. The dam plays a crucial role in harnessing the power of the San Joaquin River for hydroelectric purposes, with a maximum discharge capacity of 114,000 cubic feet per second.

Managed by the Federal Energy Regulatory Commission, Big Creek Dam No. 6 is subject to state regulations for safety and inspection, ensuring its structural integrity and compliance with operational standards. With a spillway width of 389 feet and a drainage area of 1,195 square miles, the dam's high hazard potential is mitigated by regular inspections and emergency action plans. Despite its moderate risk assessment rating, the dam continues to provide valuable water resources and contribute to the region's climate resilience through sustainable hydropower generation.

As a key component of California's water infrastructure, Big Creek Dam No. 6 exemplifies the intersection of water resource management and climate mitigation efforts. With its historical significance and ongoing operational importance, this dam serves as a symbol of innovation and sustainability in the face of evolving environmental challenges. Through effective regulation and maintenance, Big Creek Dam No. 6 continues to secure water resources for the community while supporting renewable energy production and climate resilience initiatives.

Year Completed

1923

Dam Length

495

Dam Height

155

River Or Stream

San Joaquin River

Primary Dam Type

Concrete

Surface Area

23

Hydraulic Height

155

Drainage Area

1195

Nid Storage

1726

Hazard Potential

High

Foundations

Rock

Nid Height

155
       
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.