|
Incident ID |
SD00016-3407 |
|
Dam Name |
MINA |
|
Downstream Hazard Potential |
S |
|
State |
SD |
|
Incident Date |
04/04/2019 |
|
Incident Type |
Non-failure |
|
Incident Driver |
Hydrologic/flooding |
|
Incident Mechanism 1 |
Spillway Chute Failure |
|
Incident Mechanism 2 |
|
|
Incident Mechanism 3 |
|
|
Incident Description |
During heavy spring runoff the lower portions of several slab panels along the toe of the primary concrete spillway where displaced and washed downstream. |
|
Named Hydrologic Event |
|
|
EAP Enacted (Y/N) due to Incident |
No |
|
Fatalities (Number) |
0 |
|
Number of People Evacuated |
0 |
|
Number of Habitable Structures Evacuated |
0 |
|
Number of Habitable Structures Flooded |
0 |
|
Other Infrastructure Impacts |
|
|
Economic Damages (in $) |
|
|
Volume released at failure (ac-ft) |
|
|
Response |
Increased monitoring of the spillway until water levels decreased, an in-depth spillway inspection and assessment was done Summer 2019, temporary repair was completed in Spring 2020, an updated breach analysis was done, and owner has started planning on a full replacement. |
|
Additional Remarks or Updates |
|
|
Incident Time |
|
|
Incident Duration |
|
|
Incident Report Produced |
|
|
Information Sources |
SD Dam Safety |
|
Owner Type |
S |
|
Dam Type |
RE |
|
Primary Purpose(s) |
R |
|
EAP |
N |
|
Year Completed |
1934 |
|
Year Modified |
2001 |
|
Dam Height |
32 ft |
|
Max Storage (ac-ft) |
19000 ac-ft |
|
Surface Area (acres) |
850 acres |
|
River Name |
SNAKE CREEK |
|
Latitude |
45.4417 |
|
Longitude |
-98.7317 |
|
Regulatory Agency(ies) |
DENR |
|
NID Number |
SD00016 |
|
Attachments |
|
