THOMSON DAM NO 5-1/2 - MN00604-1861
Dam Name: THOMSON DAM NO 5-1/2
State: MN
Downstream Hazard Potential: H
Incident Type: Failure
Incident Date: 06/20/2012
Incident Driver: Unknown
Incident Mechanism 1: Under Investigation
Incident Mechanism 2
Incident Mechanism 3
Incident IDMN00604-1861
Incident DescriptionThe right embankment of the headrace canal (called Forbay Lake) leading to the hydro plant failed.
Named Hydrologic Event
EAP Enacted (Y/N) due to IncidentYes
Fatalities (Number)
Number of People Evacuated160
Number of Habitable Structures Evacuated
Number of Habitable Structures Flooded
Other Infrastructure ImpactsRoads
Economic Damages (in $)
Response
Volume released at failure (ac-ft)
Additional Remarks or UpdatesHydropower plant no longer able to be fed water, MN Highway 210 failed
Owner TypeX
Dam TypePG
Primary Purpose(s)HR
EAPY
Dam Height23 ft
Max Storage (ac-ft)4352.00
Surface Area (acres)375.00
Year Completed1907
NID NumberMN00604
River NameST LOUIS RIVER
Latitude46.665
Longitude-92.4067
Year Modified
Regulatory Agency(ies)
Incident Time
Incident Duration
Incident Report Produced
Information Sources
