NEWELL - SD00011-3413
Dam Name: NEWELL
State: SD
Downstream Hazard Potential: L
Incident Type: Non-Failure
Incident Date: 05/23/2019
Incident Driver: Hydrologic/Flooding
Incident Mechanism 1: Spillway Pipe Failure
Incident Mechanism 2
Incident Mechanism 3
Incident IDSD00011-3413
Incident DescriptionHigh flows during spring of 2019 resulted in the primary spillway conduits failing on the downstream side of the dam and eroding area up to the dam crest.
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 ImpactsOther
Economic Damages (in $)
ResponseAs conditions allow owner is maintaining a lowered reservoir level to reduce flow through the primary spillway to prevent further damage.
Volume released at failure (ac-ft)
Additional Remarks or UpdatesReservoir was closed winter 2019-2020 due to concerns about ice instability as the reservoir was lower for spring.
Owner TypeS
Dam TypeRE
Primary Purpose(s)CPR
EAPNR
Dam Height28 ft
Max Storage (ac-ft)2550.00
Surface Area (acres)158.00
Year Completed1958
NID NumberSD00011
River NameWILLOW CREEK
Latitude44.835
Longitude-103.385
Year Modified
1998
Regulatory Agency(ies)DENR
Incident Time
Incident Duration
Incident Report Produced
Information SourcesSD Dam Safety
