Alessandro Reservoir Report

Last Updated: December 5, 2025

Alessandro Dam, located in Riverside, California, is a crucial structure managed by the local government for flood risk reduction.


°F

°F

mph

Wind

%

Humidity

Summary

This Earth-type dam, completed in 1956, stands at a height of 66 feet and has a storage capacity of 370 acre-feet. The dam spans 470 feet in length and is situated on Alessandro Creek, serving as a vital resource for the region's water management.

Maintained by the Department of Water Resources and Safety of Dams in California, Alessandro Dam has a high hazard potential but is currently assessed to be in satisfactory condition. Regular inspections are conducted to ensure its safety, with the last assessment performed in September 2017. The dam's emergency action plan was last revised in October 2013, highlighting the proactive measures in place to mitigate risks and protect surrounding communities in case of an emergency.

With its strategic location and crucial role in flood protection, Alessandro Dam serves as a significant asset in the water resource infrastructure of Riverside, California. Climate and water resource enthusiasts can appreciate the engineering and regulatory efforts that go into maintaining this essential structure for the region's safety and water management needs.

Year Completed

1956

Dam Length

470

Dam Height

66

River Or Stream

Alessandro Cr

Primary Dam Type

Earth

Surface Area

17

Hydraulic Height

58

Drainage Area

4.63

Nid Storage

370

Hazard Potential

High

Nid Height

66
       
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.