Jurupa Basin Reservoir Report

Last Updated: December 5, 2025

Jurupa Basin in Riverside, California, is a local government-owned earth dam that plays a crucial role in flood risk reduction along the Jurupa Wash.


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Summary

Completed in 1983, this 22-foot high structure has a storage capacity of 167 acre-feet and covers a surface area of 17 acres. With a high hazard potential, the dam's condition was last assessed as satisfactory in September 2017, and it is inspected annually to ensure its safety and functionality.

Managed by the Department of Water Resources (DWR) and regulated by the Safety of Dams agency, Jurupa Basin is equipped with state-of-the-art enforcement, inspection, and permitting mechanisms. The dam's primary purpose is flood risk reduction, reflecting its essential role in protecting the surrounding Ennis community from potential inundation. Located in the Los Angeles District, the dam stands as a testament to California's commitment to water resource management and climate resilience.

With Mark Takano as the congressional representative for the area, Jurupa Basin stands as a vital infrastructure asset in Riverside County. Its strategic location, design, and operational efficiency make it a key component in safeguarding the local environment and population from the impacts of extreme weather events. As water resource and climate enthusiasts, understanding and appreciating the significance of Jurupa Basin highlights the interconnectedness of water management, infrastructure development, and community safety in the face of changing climate patterns.

Year Completed

1983

Dam Length

1350

Dam Height

22

River Or Stream

Jurupa Wash

Primary Dam Type

Earth

Surface Area

17

Hydraulic Height

16.5

Nid Storage

167

Hazard Potential

High

Nid Height

22
       
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.