Murphys Forebay South Reservoir Report

Last Updated: December 5, 2025

Murphys Forebay South, located in Murphys, California, is a hydroelectric dam on Angels Creek with a height of 27 feet and a length of 415 feet.


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Summary

Completed in 1953, this dam provides a maximum storage capacity of 60 acre-feet and a normal storage of 57 acre-feet, covering a surface area of 3 acres. The dam has a high hazard potential and is regulated by the Federal Energy Regulatory Commission, ensuring it undergoes regular inspections and enforcement to maintain safety standards.

Managed by a public utility, Murphys Forebay South plays a crucial role in water resource management and climate resilience in Calaveras County. Its uncontrolled spillway has a maximum discharge capacity of 840 cubic feet per second, contributing to flood control measures in the region. Despite its moderate risk assessment rating, the dam's emergency action plan is periodically reviewed and updated to meet safety guidelines, with potential risk management measures in place to address any unforeseen emergencies.

With its strategic location and design, Murphys Forebay South stands as a testament to sustainable hydroelectric power generation in the area. Supported by the Federal Energy Regulatory Commission, this dam serves as a vital infrastructure for water storage and energy production, showcasing the intersection of water resource management and climate adaptation efforts. As a key player in the region's water infrastructure, Murphys Forebay South underscores the importance of proactive risk assessment and emergency preparedness to ensure the safety and stability of water resources and communities in the face of changing climate conditions.

Year Completed

1953

Dam Length

415

Dam Height

27

River Or Stream

Angels Creek

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

25

Drainage Area

1

Nid Storage

60

Structural Height

27

Hazard Potential

High

Nid Height

27
       
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.