Chinquapin Reservoir Report

Last Updated: December 5, 2025

Chinquapin, located in Mendocino County, California, is a vital local government-owned water resource infrastructure on Moore Creek.


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Summary

Completed in 1971, this Earth-type dam stands at 49 feet in height and serves primarily for water supply purposes, with a storage capacity of 45 acre-feet. Its significant hazard potential is managed well, with a satisfactory condition assessment ensuring its safety in the face of potential risks.

Managed by the Department of Water Resources and regulated for safety by the State of California, Chinquapin plays a crucial role in water management and supply for the region. With a drainage area of 0.5 square miles and a reservoir surface area of 4 acres, the dam provides essential water resources for both recreational activities and local water needs. Despite its height and hydraulic capabilities, Chinquapin has withstood the test of time, maintaining a satisfactory condition as of its last assessment in September 2017.

For water resource and climate enthusiasts, Chinquapin represents a harmonious balance between water supply and safety considerations. Located in the picturesque city of Willits and managed within the regulatory framework of the State, this dam stands as a testament to effective water management in the face of changing climate conditions. With its strategic location, robust design, and satisfactory condition, Chinquapin continues to play a vital role in ensuring water security for the local community and beyond.

Year Completed

1971

Dam Length

285

Dam Height

49

River Or Stream

Moore Creek

Primary Dam Type

Earth

Surface Area

4

Hydraulic Height

39

Drainage Area

0.5

Nid Storage

45

Hazard Potential

Significant

Nid Height

49
       
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.