Crane Valley Reservoir Report

Last Updated: December 5, 2025

Crane Valley, also known as Bass Lake, is a privately owned dam located in North Fork, California.


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Summary

Managed by the Federal Energy Regulatory Commission, this hydroelectric facility serves multiple purposes including electricity generation and recreation. The dam, with a height of 145 feet and a hydraulic height of 140.9 feet, was completed in 1910 and has a maximum storage capacity of 45,410 acre-feet.

With a high hazard potential and very high risk assessment rating, Crane Valley is closely monitored by state and federal agencies. Despite its age, the dam has remained structurally sound and is regularly inspected to ensure its safety. The spillway, with a controlled design and a width of 173 feet, helps manage excess water and prevent potential flooding downstream. While the dam's condition assessment is currently not available, emergency preparedness plans are in place, indicating a proactive approach to risk management.

Boasting a surface area of 1,165 acres and a drainage area of 39.7 square miles, Crane Valley plays a crucial role in water resource management in the region. Its strategic location on the North Fork Willow Creek enhances the water supply for agricultural, municipal, and industrial purposes. As a significant piece of infrastructure in Madera County, California, Crane Valley serves as a testament to the importance of sustainable water management practices in the face of changing climate conditions.

Year Completed

1910

Dam Length

1880

Dam Height

145

River Or Stream

North Fork Willow Creek

Surface Area

1165

Hydraulic Height

140.9

Drainage Area

39.7

Nid Storage

45410

Structural Height

145

Outlet Gates

Tainter (radial) - 2

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

145
       
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.