Stewart Canyon Debris Basin Reservoir Report

Last Updated: December 5, 2025

Stewart Canyon Debris Basin, located in Ojai, California, is a crucial structure designed for debris control along the Tr San Antonio Creek.


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Summary

Constructed in 1963, this earth dam stands at a height of 34 feet and has a hydraulic height of 20.4 feet, with a storage capacity of 67 acre-feet. The purpose of this debris basin is to mitigate the risk of debris flow and flooding in the area, demonstrating its high hazard potential but satisfactory condition as of the last assessment in September 2017.

Managed by the local government and regulated by the Department of Water Resources (DWR) under the Safety of Dams program, Stewart Canyon Debris Basin plays a vital role in protecting the surrounding community and infrastructure from the impacts of severe weather events. With a history of regular inspections and a designated emergency action plan (EAP), this structure is well-prepared to respond to any potential risks or emergencies that may arise. Its proximity to the Los Angeles District further highlights its strategic importance in water resource and climate management in Ventura County.

Overall, Stewart Canyon Debris Basin stands as a critical infrastructure asset in the region, ensuring the safety and resilience of Ojai residents against the destructive forces of nature. Its role in debris control and flood prevention underscores the importance of proactive measures in managing water resources and adapting to the challenges posed by a changing climate. As a key component of the local and state regulatory framework, this debris basin exemplifies the collaborative efforts necessary to safeguard communities and ecosystems in the face of environmental threats.

Year Completed

1963

Dam Length

1263

Dam Height

34

River Or Stream

Tr San Antonio Cr

Primary Dam Type

Earth

Surface Area

13

Hydraulic Height

20.4

Nid Storage

67

Hazard Potential

High

Nid Height

34
       
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.