OLSON DAM - ND00056-1941
Dam Name: OLSON DAM
State: ND
Downstream Hazard Potential: H
Incident Type: Non-Failure
Incident Date: 05/21/2013
Incident Driver: Hydrologic/Flooding
Incident Mechanism 1: High Reservoir Level
Incident Mechanism 2
Incident Mechanism 3
Incident IDND00056-1941
Incident DescriptionWatershed 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 IncidentYes
Fatalities (Number)
Number of People Evacuated0
Number of Habitable Structures Evacuated
Number of Habitable Structures Flooded0
Other Infrastructure ImpactsNone
Economic Damages (in $)
Response
Volume released at failure (ac-ft)
Additional Remarks or UpdatesThe 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.
Owner TypeL
Dam TypeRE
Primary Purpose(s)C
EAPY
Dam Height74 ft
Max Storage (ac-ft)1077.00
Surface Area (acres)7.00
Year Completed1957
NID NumberND00056
River NameTONGUE RIVER-TR
Latitude48.7304
Longitude-97.9466
Year Modified
1985
Regulatory Agency(ies)NDSWC
Incident Time
Incident Duration
Incident Report Produced
Information Sources
