Upper 4s Ranch

Low HazardSatisfactory ConditionEmergency Action Plan: No

Location

CountySan Diego
River/StreamLusardi Creek
Coordinates33.00050, -117.10350

Physical Characteristics

Dam TypeArch
NID Height28 ft
Dam Height28 ft
Dam Length246 ft
Year Completed1927 (99 years old)

Storage & Hydraulics

NID Storage48 acre-ft
Max Storage48 acre-ft
Surface Area10 acres
Drainage Area1 sq mi

Ownership & Safety

PurposeWater Supply
Owner4S Ranch Master Association
Owner TypePrivate
Hazard ClassificationLow
Condition AssessmentSatisfactory
Last Inspection04/23/2025
Emergency Action PlanNo

Identifiers

NID IDCA00779
Federal IDCA00779
More InfoState Dam Safety Program

Nearby Dams

4-s Ranch Reclamation Reservoir 1.1 mi High Bernardo Reservoir 1.3 mi High Black Mountain Water Tank 1.7 mi High Santa Fe Seasonal Storage 2.5 mi Low Lake Hodges 3.5 mi High Fairbanks 4.5 mi High Olivenhain 5.4 mi High Poway 5.5 mi High Miramar 5.9 mi High San Dieguito 6.1 mi High