San Antonio Reservoir Report

Last Updated: December 5, 2025

San Antonio, a public utility located in Bradley, California, operates a dam on the San Antonio River for flood risk reduction, irrigation, and water supply purposes.


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Summary

The earth dam, with a height of 202 feet and a length of 1433 feet, was completed in 1965 and has a storage capacity of 350,000 acre-feet. The dam is under state regulation and inspection by the Department of Water Resources (DWR) and the Safety of Dams agency, ensuring its safety and compliance with state requirements.

The dam's hazard potential is considered high, but its condition assessment is fair as of April 2019. Regular inspections occur every year, with the last one conducted in November 2020. Although no major modifications or risk management measures are noted in the data, the dam's emergency action plan (EAP) status and adherence to guidelines are unspecified. With its strategic location in Monterey County and its pivotal role in managing water resources, San Antonio Dam serves as a crucial infrastructure piece for the region's water security and flood protection needs.

Represented within the San Francisco District, the dam stands as a key asset in the region's water infrastructure, with the potential to mitigate flood risks and provide essential water supplies for irrigation and other purposes. As climate change continues to impact water resources, the role of San Antonio Dam in ensuring water security and managing risks associated with natural disasters like floods becomes increasingly vital. Moving forward, ongoing maintenance, risk assessments, and adherence to regulatory standards will be crucial in safeguarding this essential piece of infrastructure for the community and the environment.

Year Completed

1965

Dam Length

1433

Dam Height

202

River Or Stream

San Antonio River

Primary Dam Type

Earth

Surface Area

5720

Hydraulic Height

180

Drainage Area

353

Nid Storage

350000

Hazard Potential

High

Nid Height

202
       
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.