Wishon Reservoir Report

Last Updated: December 5, 2025

Wishon is a small community located in Fresno County, California.


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Summary

The area is well known for its history, including the development of the Wishon Dam in the early 1900s. The dam provides water to the surrounding area, including agricultural land and recreational sites. The hydrology of the area is heavily influenced by the Sierra Nevada mountains, with snowpack providing critical water sources for the region. Several surface flow providers, including the San Joaquin River and two creeks, contribute to the area's water supply. The Wishon Reservoir is a popular destination for fishing and camping, while the surrounding land is used for agriculture and grazing. Despite challenges related to drought and climate change, the Wishon area continues to play an important role in California's water and recreational industries.

Reservoir Details

Storage 24hr Change -5.69%
Percent of Normal 123%
Minimum 33,217.0 acre-ft
2009-03-01
Maximum 128,118.0 acre-ft
2011-06-24
Average 55,090 acre-ft
Nid_Height 260
Hydraulic_Height 260
Drainage_Area 177
Year_Completed 1958
Dam_Height 260
Structural_Height 260
River_Or_Stream North Fork Kings River
Primary_Dam_Type Rockfill
Foundations Unlisted/Unknown
Surface_Area 1025
Hazard_Potential High
Outlet_Gates Tainter (radial) - 6
Nid_Storage 133600
Dam_Length 3330
       
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.