|
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 |
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