SWANZY LAKE - CA00144-3590


Incident ID CA00144-3590
Dam Name SWANZY LAKE
Downstream Hazard Potential H
State CA
Incident Date 03/30/2023
Incident Type Non-failure
Incident Driver Other
Incident Mechanism 1 Landslide
Incident Mechanism 2
Incident Mechanism 3
Incident Description Elevated turbidity and groundwater intrusion near a hillside slide away from the dam embankment.
Named Hydrologic Event
EAP Enacted (Y/N) due to Incident No
Fatalities (Number) 0
Number of People Evacuated 0
Number of Habitable Structures Evacuated 0
Number of Habitable Structures Flooded 0
Other Infrastructure Impacts
Economic Damages (in $) None
Volume released at failure (ac-ft)
Response Reservoir was drained via the owner's sanitary sewer system because the outlet was not functional.
Additional Remarks or Updates Reservoir was restricted and will remain drained until the outlet's functionality is reinstated.
Incident Time 1:00 am
Incident Duration
Incident Report Produced Yes
Information Sources CA DSOD
Owner Type L
Dam Type RE
Primary Purpose(s) S
EAP Y
Year Completed 1931
Year Modified 0
Dam Height 86 ft
Max Storage (ac-ft) 107 ac-ft
Surface Area (acres) 4 acres
River Name TR CARQUINEZ STR
Latitude 38.0765
Longitude -122.227
Regulatory Agency(ies) DWR, SAFETY OF DAMS
NID Number CA00144
Attachments