Corte Madera Reservoir Report

Last Updated: December 5, 2025

Corte Madera, a privately owned dam located in San Diego, California, serves as a crucial water supply structure along the Tr Pine Valley Cr river.


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Summary

Constructed in 1919, this earth dam stands at 16 feet high with a storage capacity of 325 acre-feet, supporting both water supply and recreational purposes. With a low hazard potential and a satisfactory condition assessment as of September 2017, Corte Madera is regulated and inspected by the California Department of Water Resources (DWR) under the Safety of Dams program.

Situated in the city of Los Terrenitos, Corte Madera plays a vital role in managing water resources in the region, covering a drainage area of 2.5 square miles. Despite its age, the dam has maintained its structural integrity and safety standards, ensuring reliable water storage for the surrounding community. The dam has a surface area of 69 acres and a hydraulic height of 7.5 feet, contributing to the efficient management of water flow and storage within the reservoir.

With Juan Vargas serving as the congressional representative for the area, Corte Madera represents a key piece of infrastructure in California's water management system. The dam's last inspection in May 2020 confirmed its satisfactory condition, further solidifying its importance in providing water supply and recreational opportunities for the region. As climate change continues to impact water resources, structures like Corte Madera play a crucial role in ensuring sustainable and reliable access to water for communities in San Diego County.

Year Completed

1919

Dam Length

200

Dam Height

16

River Or Stream

Tr Pine Valley Cr

Primary Dam Type

Earth

Surface Area

69

Hydraulic Height

7.5

Drainage Area

2.5

Nid Storage

325

Hazard Potential

Low

Nid Height

16
       
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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.