TWAIN HARTE - CA00649-3424
Dam Name: TWAIN HARTE
State: CA
Downstream Hazard Potential: S
Incident Type: Non-Failure
Incident Date: 12/23/2021
Incident Driver: Other
Incident Mechanism 1: Abutment Failure
Incident Mechanism 2
Incident Mechanism 3
Incident IDCA00649-3424
Incident DescriptionReports of a single loud popping sound heard at the dam site. Potential new occurrence of rock exfoliation of the dam's abutments and foundation. Two dam inspections were conducted from which no signs of recent movement or distress of the dam, abutments, or foundation were observed. Also no new signs of rock exfoliation in the abutments and foundation. Reviewed of our files and recent survey data
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 ImpactsNone
Economic Damages (in $)None
Response
Volume released at failure (ac-ft)
Additional Remarks or Updates
Owner TypeP
Dam TypeMV
Primary Purpose(s)RS
EAPN
Dam Height36 ft
Max Storage (ac-ft)143.00
Surface Area (acres)12.00
Year Completed1928
NID NumberCA00649
River NameUNNAMED CREEK
Latitude38.0291
Longitude-120.244
Year Modified
Regulatory Agency(ies)DWR, SAFETY OF DAMS
Incident Time
Incident Duration
Incident Report ProducedYes
Information SourcesCA DSOD
