Mckays Point Diversion Reservoir Report

Last Updated: December 5, 2025

Mckays Point Diversion, located in Murphys, California, is a significant hydroelectric structure on the North Fork Stanislaus River.


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Summary

Built in 1989 by Sierra Constructors, this arch dam stands at 242 feet high and has a storage capacity of 2930 acre-feet. With a spillway width of 264 feet and a maximum discharge of 82,800 cubic feet per second, the dam plays a crucial role in water supply and hydroelectric power generation in the region.

Managed by the Federal Energy Regulatory Commission, Mckays Point Diversion is subject to state regulations and inspections to ensure its safety and compliance with operational standards. With a significant hazard potential, the dam is classified as having a moderate risk level, highlighting the importance of risk management measures and emergency preparedness. Despite its condition assessment being unavailable, the dam's Emergency Action Plan is regularly reviewed and updated to meet guidelines and ensure the safety of downstream communities in case of a potential emergency.

The dam's location within the San Francisco District and its association with multiple state and federal agencies underscore its importance in water resource management and climate adaptation efforts. As a key infrastructure for water supply and renewable energy production, Mckays Point Diversion serves as a testament to the ongoing efforts to balance water resource utilization with environmental conservation and public safety in California's diverse and dynamic landscape.

Year Completed

1989

Dam Length

820

Dam Height

242

River Or Stream

North Fork Stanislaus River

Primary Dam Type

Arch

Surface Area

34.5

Hydraulic Height

197

Drainage Area

166

Nid Storage

2930

Structural Height

242

Hazard Potential

Significant

Foundations

Rock

Nid Height

242
       
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.