Blossom Valley Reservoir Reservoir Report

Last Updated: December 5, 2025

Blossom Valley Reservoir, located in Lakeside, California, is a vital offstream water supply structure managed by a public utility.


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Summary

Built in 1962, this Earth dam stands at a height of 42 feet and has a storage capacity of 22 acre-feet. The primary purpose of the reservoir is to support irrigation and water supply needs in the region, making it a critical resource for the local community.

This reservoir is under the regulatory oversight of the California Department of Water Resources, ensuring that it meets safety and operational standards. With a high hazard potential but a satisfactory condition assessment as of September 2017, Blossom Valley Reservoir is regularly inspected to maintain its integrity. The last inspection in March 2021 reaffirmed its safe operation, highlighting the importance of proper management and upkeep of water resources in the face of changing climate conditions.

As climate change continues to impact water availability and management, reservoirs like Blossom Valley play a crucial role in safeguarding water supplies for agriculture, drinking water, and other essential needs. The reservoir's location in San Diego County underscores its significance in maintaining water security for the region, emphasizing the importance of sustainable water resource management practices for a resilient future.

Year Completed

1962

Dam Length

350

Dam Height

42

River Or Stream

Offstream

Primary Dam Type

Earth

Surface Area

1

Hydraulic Height

40.5

Nid Storage

22

Hazard Potential

High

Nid Height

42
       
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.