Bear Valley Dam Reservoir Report

Last Updated: December 5, 2025

Bear Valley Dam is a concrete gravity dam located in the Central Sierra Nevada Mountains, California.


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Summary

It was completed in 1911 by Pacific Gas and Electric Company (PG&E) to provide hydroelectric power to nearby communities. The dam is 218 feet high and impounds Bear Valley Reservoir with a capacity of 90,000 acre-feet. The dam is mainly fed by the Mokelumne River and its tributaries, which are known for their snowpack and are important sources of water for agriculture and urban areas in California. The dam's watershed also provides recreational opportunities for visitors, including fishing, camping, and hiking. In recent years, the dam has been under scrutiny for its safety and seismic stability, leading to upgrades and retrofits to ensure its longevity.

Reservoir Details

24hr Change None%
Percent of Normal None%
Minimum
Maximum
Average
Dam_Height 80
Hydraulic_Height 80
Drainage_Area 38.7
Year_Completed 1911
Nid_Storage 74000
Surface_Area 2649
Hazard_Potential High
River_Or_Stream Bear Creek
Dam_Length 360
Primary_Dam_Type Multi-Arch
Nid_Height 80
       
Seasonal Comparison
Storage Levels
Pool Elevation Levels
Top Conserv Storage Levels
Inflow Levels

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.