NEWELL - SD00011-3413


Incident ID SD00011-3413
Dam Name NEWELL
Downstream Hazard Potential L
State SD
Incident Date 05/23/2019
Incident Type Non-failure
Incident Driver Hydrologic/flooding
Incident Mechanism 1 Spillway Pipe Failure
Incident Mechanism 2
Incident Mechanism 3
Incident Description High 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 Incident No
Fatalities (Number) 0
Number of People Evacuated unknown
Number of Habitable Structures Evacuated unknown
Number of Habitable Structures Flooded unknown
Other Infrastructure Impacts Other
Economic Damages (in $)
Volume released at failure (ac-ft)
Response As conditions allow owner is maintaining a lowered reservoir level to reduce flow through the primary spillway to prevent further damage.
Additional Remarks or Updates Reservoir was closed winter 2019-2020 due to concerns about ice instability as the reservoir was lower for spring.
Incident Time
Incident Duration
Incident Report Produced
Information Sources SD Dam Safety
Owner Type S
Dam Type RE
Primary Purpose(s) CPR
EAP NR
Year Completed 1958
Year Modified 1998
Dam Height 28 ft
Max Storage (ac-ft) 2550 ac-ft
Surface Area (acres) 158 acres
River Name WILLOW CREEK
Latitude 44.835
Longitude -103.385
Regulatory Agency(ies) DENR
NID Number SD00011
Attachments