Wishon Auxiliary No. 1 Reservoir Report

Last Updated: December 5, 2025

Wishon Auxiliary No.


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Summary

1 is a concrete gravity dam located in Wishon Village, Fresno County, California. Built in 1958, this hydroelectric dam stands at a height of 26 feet with a storage capacity of 133,600 acre-feet. The primary purpose of this dam is to generate hydroelectric power, making it a crucial structure in the region's water resource management.

Managed by a private owner, Wishon Auxiliary No. 1 is regulated by the California Department of Water Resources and inspected by the Federal Energy Regulatory Commission. With a significant hazard potential and high risk assessment rating, this dam plays a vital role in flood control and water storage for the North Fork Kings River. Despite its age, the dam continues to operate efficiently, showcasing the importance of regular maintenance and monitoring in safeguarding our water resources and infrastructure.

As a key component of the water infrastructure in California, Wishon Auxiliary No. 1 exemplifies the intersection of climate, water resources, and energy production. Its strategic location, structural design, and operational capacity contribute to the sustainable management of water resources in the region. With a focus on safety and regulatory compliance, this dam serves as a critical asset in ensuring water security and resilience in the face of changing climate conditions.

Year Completed

1958

Dam Length

220

Dam Height

26

River Or Stream

North Fork Kings River

Primary Dam Type

Concrete

Surface Area

1025

Hydraulic Height

26

Drainage Area

177

Nid Storage

133600

Structural Height

26

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

26
       
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.