4-S Ranch Reclamation Reservoir Reservoir Report

Last Updated: December 5, 2025

The 4-S Ranch Reclamation Reservoir, located in Rancho Bernardo, California, is a vital water supply structure designed to serve the community's irrigation and water supply needs.


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Summary

Completed in 2000, this earth dam stands at a height of 22 feet, with a storage capacity of 410 acre-feet and a surface area of 13 acres. The reservoir is situated along the Artesian Creek and is regulated by the Department of Water Resources, ensuring its safety and compliance with state regulations.

With a high hazard potential but a satisfactory condition assessment as of September 2017, the 4-S Ranch Reclamation Reservoir plays a crucial role in water management in San Diego County. Its primary purpose is to provide a reliable water source for agricultural irrigation and domestic use. The dam's inspection frequency, emergency action plan preparedness, and risk management measures are all in place to safeguard the surrounding community in the event of any unforeseen emergencies. The reservoir's strategic location and design make it an essential asset for water resource and climate enthusiasts interested in sustainable water supply infrastructure.

Year Completed

2000

Dam Length

1270

Dam Height

22

River Or Stream

Artesian Creek

Primary Dam Type

Earth

Surface Area

13

Hydraulic Height

18.8

Nid Storage

410

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.