|
Incident ID |
SD00688-3412 |
|
Dam Name |
NEW STICKNEY (NELSON) |
|
Downstream Hazard Potential |
L |
|
State |
SD |
|
Incident Date |
09/11/2019 |
|
Incident Type |
Failure |
|
Incident Driver |
Hydrologic/flooding |
|
Incident Mechanism 1 |
Unknown |
|
Incident Mechanism 2 |
|
|
Incident Mechanism 3 |
|
|
Incident Description |
Wide 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 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 |
|
|
Economic Damages (in $) |
|
|
Volume released at failure (ac-ft) |
|
|
Response |
State 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. |
|
Additional Remarks or Updates |
Reservoir 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. |
|
Incident Time |
|
|
Incident Duration |
|
|
Incident Report Produced |
|
|
Information Sources |
SD Dam Safety |
|
Owner Type |
S |
|
Dam Type |
RE |
|
Primary Purpose(s) |
R |
|
EAP |
NR |
|
Year Completed |
1965 |
|
Year Modified |
0 |
|
Dam Height |
18 ft |
|
Max Storage (ac-ft) |
177 ac-ft |
|
Surface Area (acres) |
14 acres |
|
River Name |
TR-JAMES |
|
Latitude |
43.6217 |
|
Longitude |
-98.355 |
|
Regulatory Agency(ies) |
DENR |
|
NID Number |
SD00688 |
|
Attachments |
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