Mono Creek Diversion Reservoir Report

Last Updated: December 5, 2025

Mono Creek Diversion, also known as Mono Diversion, is a private hydroelectric structure located in Fresno, California.


°F

°F

mph

Wind

%

Humidity

Summary

This concrete dam, completed in 1927, stands at a height of 64 feet and has a maximum storage capacity of 45 acre-feet. With a low hazard potential and moderate risk assessment, the dam is regulated by the Federal Energy Regulatory Commission and inspected regularly to ensure safety and compliance with state regulations.

Situated on Mono Creek, this diversion plays a crucial role in generating hydroelectric power for the surrounding area. The spillway, with a width of 106 feet, allows for the controlled release of water during periods of high flow. Despite its age, the dam remains in good condition, with the last inspection conducted in July 2017. The emergency action plan, last revised in November 2020, ensures preparedness for any potential risks associated with the structure.

Managed by a private entity, Mono Creek Diversion serves as a key component of the local water resource infrastructure. With its strategic location and efficient design, the dam contributes to the sustainable utilization of water resources while mitigating potential environmental impacts. Climate enthusiasts and water resource experts alike can appreciate the ingenuity and functionality of this historic hydroelectric facility in the heart of California's scenic landscape.

Year Completed

1927

Dam Length

156

Dam Height

64

River Or Stream

Mono Creek

Primary Dam Type

Concrete

Surface Area

1

Hydraulic Height

64

Nid Storage

45

Hazard Potential

Low

Foundations

Rock

Nid Height

64
       
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.