Collett Reservoir Report

Last Updated: December 5, 2025

Collett, a privately owned dam located in Pitville, California, is a key player in the state's water resource management and climate adaptation efforts.


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Summary

Built in 1991 by CH2M Hill, this earth dam stands at a height of 40 feet and has a hydraulic height of 35 feet. With a storage capacity of 7690 acre-feet, Collett primarily serves the purpose of generating hydroelectric power, contributing to California's renewable energy initiatives.

Managed by the Federal Energy Regulatory Commission, Collett has been deemed to have a low hazard potential and a moderate risk level. Despite its relatively low risk, the dam is subject to regular state inspections, enforcement, and permitting to ensure its structural integrity and safety. With its location along the Pit River and a maximum discharge capacity of 700 cubic feet per second, Collett plays a crucial role in flood control and water management in the region.

With its strategic location and functionality, Collett serves as a vital asset in California's water infrastructure, contributing to the state's resilience against climate change impacts. Its incorporation of hydroelectric generation aligns with the state's renewable energy goals, showcasing how water resources can be harnessed for both sustainability and disaster risk reduction purposes.

Year Completed

1991

Dam Length

2900

Dam Height

40

River Or Stream

Pit River - Offstream

Primary Dam Type

Earth

Surface Area

255

Hydraulic Height

35

Nid Storage

7690

Structural Height

40

Hazard Potential

Low

Nid Height

40
       
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.