Haynes Reservoir Reservoir Report

Last Updated: December 5, 2025

Haynes Reservoir, also known as Lake Margaret, is a privately owned dam located in Big Bend, California.


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Summary

Completed in 1965, this earth dam stands at a height of 67 feet and has a storage capacity of 5870 acre-feet, serving primarily for flood risk reduction. Situated on Goose Creek with a drainage area of 5.3 square miles, the reservoir covers a surface area of 241 acres and plays a vital role in irrigation and water supply in the region.

With its high hazard potential and satisfactory condition assessment, Haynes Reservoir is regulated by the California Department of Water Resources for safety and compliance. The dam, with a hydraulic height of 62.5 feet, is designed to withstand potential risks and is subject to regular inspections to ensure its structural integrity. The surrounding area, under the jurisdiction of the state, benefits from this reservoir's flood protection measures and water resource management.

Managed by private owners, Haynes Reservoir contributes significantly to the local community by mitigating flood risks and providing essential water resources. The dam's strategic location on Goose Creek, overseen by state regulatory agencies, highlights its importance in safeguarding the region against potential water-related hazards while supporting agricultural and urban water needs. Enthusiasts of water resources and climate will appreciate the role of Haynes Reservoir in balancing flood control, irrigation, and water supply in Shasta County, California.

Year Completed

1965

Dam Length

875

Dam Height

67

River Or Stream

Goose Creek

Primary Dam Type

Earth

Surface Area

241

Hydraulic Height

62.5

Drainage Area

5.3

Nid Storage

5870

Hazard Potential

High

Nid Height

67
       
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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.