|
Incident ID |
ND00056-1941 |
|
Dam Name |
OLSON DAM |
|
Downstream Hazard Potential |
H |
|
State |
ND |
|
Incident Date |
05/21/2013 |
|
Incident Type |
Non-failure |
|
Incident Driver |
Hydrologic/flooding |
|
Incident Mechanism 1 |
High Reservoir Level |
|
Incident Mechanism 2 |
|
|
Incident Mechanism 3 |
|
|
Incident Description |
Watershed received 4-6 inches of rain on May 20, 2013. The reservoir was already full from heavy late season snow and late season snowmelt runoff. Water flowed through both of the dam's earthen auxiliary spillways. See additional remarks below. |
|
Named Hydrologic Event |
|
|
EAP Enacted (Y/N) due to Incident |
Yes |
|
Fatalities (Number) |
|
|
Number of People Evacuated |
0 |
|
Number of Habitable Structures Evacuated |
|
|
Number of Habitable Structures Flooded |
0 |
|
Other Infrastructure Impacts |
None |
|
Economic Damages (in $) |
|
|
Volume released at failure (ac-ft) |
|
|
Response |
|
|
Additional Remarks or Updates |
The dam was damaged as a result of the flow through the auxiliary spillways. A major slide occurred on the left spillway dike of the south auxiliary spillway, taking out a section of the dike. Some headcutting occurred in the north auxiliary spillway. |
|
Incident Time |
|
|
Incident Duration |
|
|
Incident Report Produced |
|
|
Information Sources |
|
|
Owner Type |
L |
|
Dam Type |
RE |
|
Primary Purpose(s) |
C |
|
EAP |
Y |
|
Year Completed |
1957 |
|
Year Modified |
1985 |
|
Dam Height |
74 ft |
|
Max Storage (ac-ft) |
1077 ac-ft |
|
Surface Area (acres) |
7 acres |
|
River Name |
TONGUE RIVER-TR |
|
Latitude |
48.7304 |
|
Longitude |
-97.9466 |
|
Regulatory Agency(ies) |
NDSWC |
|
NID Number |
ND00056 |
|
Attachments |
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