Delta Pond Reservoir Report

Last Updated: December 5, 2025

Delta Pond, located in Sonoma, California, is a significant Earth dam completed in 1984 for water supply purposes.


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Summary

With a height of 27 feet and a hydraulic height of 24 feet, it serves multiple functions including flood risk reduction, irrigation, and water supply. The dam has a storage capacity of 1950 acre-feet and a surface area of 94 acres, making it a crucial asset for the local community.

Managed by the local government, Delta Pond is regulated by the California Department of Water Resources (DWR) for safety and enforcement. Despite its significant hazard potential, the dam is in satisfactory condition according to the last assessment in 2017. With inspection frequency of once a year, the dam has been maintained to meet regulatory standards and ensure its structural integrity.

Situated along the Tr Russian River, Delta Pond plays a vital role in the water resource management of the region. With its strategic location and purposeful design, it continues to provide essential services while mitigating risks associated with flooding and water scarcity. For water resource and climate enthusiasts, Delta Pond stands as a testament to efficient infrastructure management in the face of environmental challenges.

Year Completed

1984

Dam Length

11000

Dam Height

27

River Or Stream

Tr Russian Rv

Primary Dam Type

Earth

Surface Area

94

Hydraulic Height

24

Nid Storage

1950

Hazard Potential

Significant

Nid Height

27
       
Seasonal Comparison

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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.