MCMAHON - CA00701-1900
Dam Name: MCMAHON
State: CA
Downstream Hazard Potential: S
Incident Type: Non-Failure
Incident Date: 04/17/2012
Incident Driver: Manmade Action
Incident Mechanism 1: Spillway Pipe Failure
Incident Mechanism 2
Incident Mechanism 3
Incident IDCA00701-1900
Incident DescriptionSudden closure d/s valve while u/s valve was open, the hydraulic pressure caused an 8-inch section of PVC pipe to rupture.
Named Hydrologic Event
EAP Enacted (Y/N) due to IncidentNo
Fatalities (Number)
Number of People Evacuated0
Number of Habitable Structures Evacuated
Number of Habitable Structures Flooded0
Other Infrastructure ImpactsNone
Economic Damages (in $)
Response
Volume released at failure (ac-ft)
Additional Remarks or UpdatesAn 8-inch diameter TEE of of the main outlet pipe ruptures while attempting to close the d/s butterfly valve. Small uncontrolled release, no other significant damage
Owner TypeP
Dam TypeRE
Primary Purpose(s)IS
EAPNR
Dam Height52 ft
Max Storage (ac-ft)878.00
Surface Area (acres)26.00
Year Completed1957
NID NumberCA00701
River NameMAXWELL CREEK
Latitude37.6997
Longitude-120.201
Year Modified
Regulatory Agency(ies)Division of Safety of Dams
Incident Time
Incident Duration
Incident Report Produced
Information Sources
