Gene Wash Reservoir Report

Last Updated: December 7, 2025

Gene Wash is a remarkable dam located in San Bernardino, California, serving as a vital part of the state's water supply infrastructure.


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Summary

Built in 1937, this arch-type dam stands at a height of 140 feet and has a storage capacity of 6,300 acre-feet. Situated on the Gene Wash river, this structure plays a crucial role in regulating water flow and ensuring a stable water supply for the surrounding areas, especially in times of high demand or drought.

Owned and regulated by the California Department of Water Resources (DWR), Gene Wash is subject to regular inspections and enforcement to maintain its structural integrity and ensure public safety. With a high hazard potential due to its location and purpose, the dam is considered satisfactory in terms of condition assessment. Its emergency action plan is regularly updated and meets guidelines to effectively manage any potential risks or emergencies, demonstrating a commitment to safety and preparedness in the face of changing climate conditions and water resource management challenges.

As part of the larger water management system in California, Gene Wash serves as a critical piece of infrastructure for water supply in the region. With its strategic location and efficient design, this dam plays a key role in supporting the state's water needs and ensuring a reliable source of water for agricultural, industrial, and residential purposes. As climate change continues to impact water resources, structures like Gene Wash will become increasingly important in managing water supply and mitigating the effects of an uncertain future.

Year Completed

1937

Dam Length

383

Dam Height

140

River Or Stream

Gene Wash

Primary Dam Type

Arch

Surface Area

224

Hydraulic Height

126.5

Drainage Area

5.9

Nid Storage

6300

Hazard Potential

High

Nid Height

140
       
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.