|
Incident ID |
SD00031-3411 |
|
Dam Name |
EAST VERMILLION |
|
Downstream Hazard Potential |
L |
|
State |
SD |
|
Incident Date |
09/11/2019 |
|
Incident Type |
Non-failure |
|
Incident Driver |
Hydrologic/flooding |
|
Incident Mechanism 1 |
Spillway Erosion/head Cutting |
|
Incident Mechanism 2 |
|
|
Incident Mechanism 3 |
|
|
Incident Description |
Earthcut secondary spillway experienced significant heading cutting when it operated during as a result of runoff from heavy rainfalls on Sept. 11-12, 2019. |
|
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 |
Roads |
|
Economic Damages (in $) |
|
|
Volume released at failure (ac-ft) |
|
|
Response |
Owner increased monitoring of the dam and secondary spillway until water levels dropped. East campground and boat ramp was temporarily closed and assistance was provided to get groceries to any stranded campers. |
|
Additional Remarks or Updates |
Downstream road was washed out. Access road to east campground and boat ramp access the secondary spillway was washed out. Several campers were stranded in the east campground until the access road was repair. Secondary spillway damage was repaired Winter 2019. |
|
Incident Time |
|
|
Incident Duration |
|
|
Incident Report Produced |
|
|
Information Sources |
SD Dam Safety |
|
Owner Type |
S |
|
Dam Type |
RE |
|
Primary Purpose(s) |
CR |
|
EAP |
NR |
|
Year Completed |
1958 |
|
Year Modified |
1994 |
|
Dam Height |
41 ft |
|
Max Storage (ac-ft) |
17400 ac-ft |
|
Surface Area (acres) |
294 acres |
|
River Name |
E FORK VERMILLION RIVER |
|
Latitude |
43.59 |
|
Longitude |
-97.1717 |
|
Regulatory Agency(ies) |
DENR |
|
NID Number |
SD00031 |
|
Attachments |
|
