Lake O'neill Dam

High HazardFair ConditionEmergency Action Plan: Yes

Location

StateCalifornia
CountySan Diego
Nearest City22 AREA -CHAPPO
River/StreamSANTA MARGARITA RIV OFFSTREAM
Coordinates33.32700, -117.32700

Physical Characteristics

Dam TypeEarth
NID Height17 ft
Dam Height14 ft
Dam Length1,500 ft
Year Completed1883 (143 years old)

Storage & Hydraulics

NID Storage1,395 acre-ft
Max Storage1,395 acre-ft
Normal Storage1,057 acre-ft
Surface Area115 acres
Drainage Area9 sq mi
Max Discharge800 cfs
Spillway TypeUncontrolled

Ownership & Safety

PurposeFire Protection, Stock, Or Small Fish Pond
OwnerDOD USMC
Owner TypeFederal
Hazard ClassificationHigh
Condition AssessmentFair
Last Inspection06/23/2017
Emergency Action PlanYes

Identifiers

NID IDCA10131
Federal IDCA10131
More InfoState Dam Safety Program

Nearby Dams

Pilgrim Creek Lake Dam 3.7 mi Low Pulgas Lake Dam 6.5 mi Low Beck 9.3 mi Low Red Mountain Reservoir 9.3 mi High Matthews 9.9 mi Low Case Springs Dam 10.1 mi Low Calavera 11.1 mi High Maerkle 12.7 mi High