Seven Oaks Reservoir Report

Last Updated: December 5, 2025

Seven Oaks is a rockfill dam located in Yucaipa, California, along the Santa Ana River.


°F

°F

mph

Wind

%

Humidity

Summary

Completed in 1999, this dam stands at a height of 550 feet with a storage capacity of 145,600 acre-feet. Its primary purpose is flood risk reduction, serving as a crucial structure in protecting the surrounding area from potential inundation during heavy rainfall events. The dam is regulated by the California Department of Water Resources and undergoes regular inspections to ensure its structural integrity.

With a high hazard potential but a satisfactory condition assessment as of September 2017, Seven Oaks plays a vital role in water resource management and climate resilience in the region. The dam's design and construction reflect a commitment to safeguarding the community from flooding and mitigating potential risks associated with its operation. The dam's strategic location and storage capacity contribute to the overall flood risk reduction efforts in the area, making it an essential component of the local water infrastructure.

Managed by the local government, Seven Oaks serves as a testament to the collaborative efforts of various agencies and stakeholders in addressing water resource challenges. Its presence highlights the importance of proactive measures in adapting to climate change impacts and ensuring the safety and security of the surrounding communities. As a key asset in flood risk reduction, Seven Oaks stands as a symbol of resilience and preparedness in the face of evolving environmental conditions.

Year Completed

1999

Dam Length

2980

Dam Height

550

River Or Stream

Santa Ana Riv

Primary Dam Type

Rockfill

Surface Area

780

Hydraulic Height

520

Drainage Area

177

Nid Storage

145600

Hazard Potential

High

Nid Height

550
       
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.