MINA - SD00016-3407
Dam Name: MINA
State: SD
Downstream Hazard Potential: S
Incident Type: Non-Failure
Incident Date: 04/04/2019
Incident Driver: Hydrologic/Flooding
Incident Mechanism 1: Spillway Chute Failure
Incident Mechanism 2
Incident Mechanism 3
Incident IDSD00016-3407
Incident DescriptionDuring 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 IncidentNo
Fatalities (Number)0
Number of People Evacuated0
Number of Habitable Structures Evacuated0
Number of Habitable Structures Flooded0
Other Infrastructure Impacts
Economic Damages (in $)
ResponseIncreased 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.
Volume released at failure (ac-ft)
Additional Remarks or Updates
Owner TypeS
Dam TypeRE
Primary Purpose(s)R
EAPN
Dam Height32 ft
Max Storage (ac-ft)19000.00
Surface Area (acres)850.00
Year Completed1934
NID NumberSD00016
River NameSNAKE CREEK
Latitude45.4417
Longitude-98.7317
Year Modified
2001
Regulatory Agency(ies)DENR
Incident Time
Incident Duration
Incident Report Produced
Information SourcesSD Dam Safety
