LAKE HANSON - SD00691-3416
Dam Name: LAKE HANSON
State: SD
Downstream Hazard Potential: L
Incident Type: Failure
Incident Date: 05/05/2007
Incident Driver: Hydrologic/Flooding
Incident Mechanism 1: Spillway Erosion/Head Cutting
Incident Mechanism 2
Incident Mechanism 3
Incident IDSD00691-3416
Incident DescriptionApproximately 8 to 10 inches of precipitation fell over a large portion of the watershed and caused operation of the earthen secondary spillway which headcut back to the reservoir.
Named Hydrologic Event
EAP Enacted (Y/N) due to IncidentNo
Fatalities (Number)0
Number of People Evacuatedunknown
Number of Habitable Structures Evacuatedunknown
Number of Habitable Structures Floodedunknown
Other Infrastructure Impacts
Economic Damages (in $)
Response
Volume released at failure (ac-ft)
Additional Remarks or UpdatesThere was also minor damage to the primary spillway and some erosion of the embankment due to flow from secondary. Secondary was partially repaired in June 2007.
Owner TypeS
Dam TypeRE
Primary Purpose(s)R
EAPNR
Dam Height24 ft
Max Storage (ac-ft)340.00
Surface Area (acres)0.00
Year Completed1932
NID NumberSD00691
River NameTR-JAMES
Latitude43.625
Longitude-97.805
Year Modified
1996
Regulatory Agency(ies)DENR
Incident Time
Incident Duration
Incident Report Produced
Information SourcesSD Dam Safety
