Upper Bear Reservoir Report

Last Updated: December 4, 2025

Upper Bear is a privately-owned hydroelectric dam located in Pioneer, California, along the Bear River.


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Summary

Constructed in 1900, this rockfill dam stands at a height of 77 feet and has a storage capacity of 7,306 acre-feet. With a normal storage capacity of 6,760 acre-feet and a surface area of 173 acres, Upper Bear plays a crucial role in water resource management in the region.

Managed by the Federal Energy Regulatory Commission, Upper Bear has a high hazard potential and a moderate risk assessment rating. Although the condition assessment is not available, the dam undergoes regular inspections and has an emergency action plan in place. With a maximum discharge capacity of 19,280 cubic feet per second and an uncontrolled spillway width of 355 feet, Upper Bear is equipped to handle varying water levels and ensure community safety in case of emergencies.

Water resource and climate enthusiasts interested in the infrastructure and environmental impact of dams will find Upper Bear's data intriguing. From its historical significance as a hydroelectric facility to its current risk management measures, Upper Bear serves as a vital component in the water supply and flood control system of Amador County, California.

Year Completed

1900

Dam Length

760

Dam Height

77

River Or Stream

Bear River

Primary Dam Type

Rockfill

Surface Area

173

Hydraulic Height

60.5

Drainage Area

28

Nid Storage

7306

Structural Height

77

Hazard Potential

High

Nid Height

77
       
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.