Lake Cuyamaca Reservoir Report

Last Updated: December 5, 2025

Lake Cuyamaca is a picturesque reservoir located in Cuyamaca, California, owned and regulated by the state's Department of Water Resources and Safety of Dams.


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Summary

Built in 1968, this earth dam stands at a height of 17 feet and serves as a vital water supply source for the region with a storage capacity of 1000 acre-feet. The dam also supports recreational activities and covers a surface area of 110 acres, offering a tranquil escape for water resource and climate enthusiasts.

Managed by a public utility, Lake Cuyamaca's low hazard potential and satisfactory condition make it a safe and reliable water source. The dam overlooks the scenic Boulder Creek, with a drainage area of 12 square miles. Despite its modest size, the reservoir plays a crucial role in water supply management for San Diego County and provides a serene backdrop for outdoor recreation. With its strategic location and well-maintained infrastructure, Lake Cuyamaca stands as a testament to sustainable water resource management in the face of changing climate patterns.

For those interested in the intersection of water resources and climate change, Lake Cuyamaca offers a fascinating case study in dam construction and regulation. With state permitting, inspection, and enforcement in place, the dam serves as a model for responsible water infrastructure development. As climate variability continues to impact water availability, Lake Cuyamaca stands as a resilient water source that not only meets the region's needs but also provides a haven for nature enthusiasts seeking solace in its tranquil waters.

Year Completed

1968

Dam Length

1027

Dam Height

17

River Or Stream

Boulder Creek

Primary Dam Type

Earth

Surface Area

110

Hydraulic Height

14

Drainage Area

12

Nid Storage

1000

Hazard Potential

Low

Nid Height

17
       
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.