Bailey Debris Basin Reservoir Report

Last Updated: December 5, 2025

Bailey Debris Basin, located in Sierra Madre, California, is a crucial structure designed for debris control and flood risk reduction along Bailey Can Wash.


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Summary

Built in 1954, this earth dam stands at a height of 43 feet and spans a length of 585 feet, with a maximum storage capacity of 49 acre-feet. Despite its age, the dam is in satisfactory condition, as assessed in September 2017, and is regulated, inspected, and enforced by the Department of Water Resources (DWR) for safety compliance.

With a hazard potential rated as high, Bailey Debris Basin plays a vital role in protecting the surrounding area from potential flooding and debris flow events. The dam's ability to hold back sediment and large debris during heavy rainfall events helps to mitigate the risk of downstream flooding and property damage. Regular inspections and a comprehensive emergency action plan ensure that the structure is well-maintained and prepared to respond effectively in case of an emergency.

Managed by the local government, Bailey Debris Basin serves as a key component of the flood control infrastructure in Los Angeles County. Its strategic location and design provide a valuable defense against the impact of extreme weather events, safeguarding lives and properties in the region. Water resource and climate enthusiasts can appreciate the important role that structures like Bailey Debris Basin play in enhancing community resilience and reducing the impact of natural disasters on vulnerable areas.

Year Completed

1954

Dam Length

585

Dam Height

43

River Or Stream

Bailey Can Wash

Primary Dam Type

Earth

Surface Area

2.5

Hydraulic Height

30.42

Drainage Area

0.58

Nid Storage

49

Hazard Potential

High

Nid Height

43
       
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.