San Sevaine Basin #5 Reservoir Report

Last Updated: December 5, 2025

San Sevaine Basin #5 is a local government-owned earth dam located in Fontana, California, designed for debris control along the San Sevaine Creek.


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Summary

Completed in 2004, this dam stands at a height of 49 feet and has a storage capacity of 2765 acre-feet. With a drainage area of 11.2 square miles, it serves to reduce flood risk in the region and has a spillway width, outlet gates, and locks for efficient water management.

The dam, with a surface area of 71 acres, has a high hazard potential but is in satisfactory condition according to a 2017 assessment. Inspected regularly, the dam meets state regulatory requirements for safety and undergoes enforcement and maintenance as needed. Located in San Bernardino County, the dam plays a crucial role in protecting the surrounding area from debris and flood damage, highlighting the importance of effective water resource management in the face of changing climate patterns.

Managed by the California Department of Water Resources, San Sevaine Basin #5 stands as a vital infrastructure for ensuring the safety and security of the community. With a focus on debris control and flood risk reduction, this dam exemplifies the proactive measures taken to safeguard water resources amidst the challenges posed by climate variability. As a key component of the local water infrastructure, its efficient operation and maintenance are essential for sustainable water management in the region.

Year Completed

2004

Dam Length

9000

Dam Height

49

River Or Stream

San Sevaine Creek

Primary Dam Type

Earth

Surface Area

71

Hydraulic Height

33.9

Drainage Area

11.2

Nid Storage

2765

Hazard Potential

High

Nid Height

49
       
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.