Cogswell

California, Los Angeles County, Wfk San Gabriel R

Location

StateCalifornia
CountyLos Angeles
RiverWfk San Gabriel R
Coordinates34.24410, -117.96490

Physical Characteristics

NID Height266 ft
Dam Height266 ft
Dam Length585 ft
NID Storage8,969 acre-ft
Max Storage8,969 acre-ft
Surface Area146 acres

Safety Classification

Hazard PotentialHigh
Condition AssessmentSatisfactory
EAP StatusYes
Last InspectionOctober 15, 2025
Inspection Frequency1

Dam Information

Year Completed1935
Primary PurposeFlood Risk Reduction
Dam TypeRockfill
Owner TypeLocal Government
OwnerLos Angeles County Department Of Public Works

Location Map

About This Dam Record

Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.

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