NEW STICKNEY (NELSON) - SD00688-3412
Dam Name: NEW STICKNEY (NELSON)
State: SD
Downstream Hazard Potential: L
Incident Type: Failure
Incident Date: 09/11/2019
Incident Driver: Hydrologic/Flooding
Incident Mechanism 1: Unknown
Incident Mechanism 2
Incident Mechanism 3
Incident IDSD00688-3412
Incident DescriptionWide spread rainfall on saturated ground ranging from 5 to 10 inches between September 11-12, 2019. High flows contributed to significant erosion around conduits of primary spillway back to the reservoir and partial failure of the dam.
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 $)
ResponseState dam safety staff did a site visit on Sept. 17, 2019 and notified dam owner of the observed damage. Site condition limited access to damaged areas of the dam at the time of visit.
Volume released at failure (ac-ft)
Additional Remarks or UpdatesReservoir still had some storage capacity after incident but it is limited by the erosion damage. A small area of erosion/slide damage extending into the upstream face of the dam also resulted from the event. A small sinkhole in the embankment above the primary spillway conduits was reported in the last dam inspection prior to the event.
Owner TypeS
Dam TypeRE
Primary Purpose(s)R
EAPNR
Dam Height18 ft
Max Storage (ac-ft)177.00
Surface Area (acres)14.00
Year Completed1965
NID NumberSD00688
River NameTR-JAMES
Latitude43.6217
Longitude-98.355
Year Modified
Regulatory Agency(ies)DENR
Incident Time
Incident Duration
Incident Report Produced
Information SourcesSD Dam Safety
