SWANZY LAKE - CA00144-3590
Dam Name: SWANZY LAKE
State: CA
Downstream Hazard Potential: H
Incident Type: Non-Failure
Incident Date: 03/30/2023
Incident Driver: Other
Incident Mechanism 1: Landslide
Incident Mechanism 2
Incident Mechanism 3
Incident IDCA00144-3590
Incident DescriptionElevated turbidity and groundwater intrusion near a hillside slide away from the dam embankment.
Named Hydrologic Event
EAP Enacted (Y/N) due to IncidentNo
Fatalities (Number)0
Number of People Evacuated0
Number of Habitable Structures Evacuated0
Number of Habitable Structures Flooded0
Other Infrastructure Impacts
Economic Damages (in $)None
ResponseReservoir was drained via the owner's sanitary sewer system because the outlet was not functional.
Volume released at failure (ac-ft)
Additional Remarks or UpdatesReservoir was restricted and will remain drained until the outlet's functionality is reinstated.
Owner TypeL
Dam TypeRE
Primary Purpose(s)S
EAPY
Dam Height86 ft
Max Storage (ac-ft)107.00
Surface Area (acres)4.00
Year Completed1931
NID NumberCA00144
River NameTR CARQUINEZ STR
Latitude38.0765
Longitude-122.227
Year Modified
Regulatory Agency(ies)DWR, SAFETY OF DAMS
Incident Time1:00 am
Incident Duration
Incident Report ProducedYes
Information SourcesCA DSOD
