Brea Dam Reservoir Report

Last Updated: December 5, 2025

Brea Dam, also known as Brea Reservoir, is a key federal structure in Fullerton, California, managed by the US Army Corps of Engineers.


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Summary

Completed in 1942, this earth dam stands at a height of 87 feet and serves primarily for flood risk reduction along Brea Creek. With a storage capacity of 7,420 acre-feet, the dam plays a crucial role in managing water levels and preventing downstream flooding.

The dam's uncontrolled spillway, vertical lift outlet gates, and high hazard potential highlight the importance of effective risk management measures in place. The USACE continuously monitors the dam's condition, conducts regular inspections, and engages with local emergency managers to ensure preparedness for any potential emergency situations. By actively managing flood risks and maintaining the dam's structural integrity, the USACE aims to safeguard the surrounding communities and infrastructure from the impacts of severe weather events and potential dam failures.

As a popular recreational site in Orange County, Brea Dam not only provides flood protection but also offers opportunities for outdoor activities. With a focus on public safety and risk reduction, the USACE is committed to enhancing the dam's resilience and ensuring its effective operation for the benefit of the community.

Year Completed

1942

Dam Length

1765

Dam Height

87

River Or Stream

BREA CREEK

Primary Dam Type

Earth

Surface Area

1

Hydraulic Height

75

Drainage Area

22

Nid Storage

7420

Outlet Gates

Vertical Lift - 0

Hazard Potential

High

Nid Height

87
       
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.