MENNO DAM - SD00026-3409
Dam Name: MENNO DAM
State: SD
Downstream Hazard Potential: H
Incident Type: Non-Failure
Incident Date: 08/01/2019
Incident Driver: Hydrologic/Flooding
Incident Mechanism 1: Spillway Erosion/Head Cutting
Incident Mechanism 2Animal Activity
Incident Mechanism 3
Incident IDSD00026-3409
Incident DescriptionSecondary spillway experienced significant heading cutting when it operated during both April and August of 2019. Erosion related to livestock grazing on the spillway likely contributed to the development of the issue.
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 $)
ResponseOwner increased monitoring of the dam and secondary spillway until it was repaired in Fall of 2019.
Volume released at failure (ac-ft)
Additional Remarks or Updates
Owner TypeS
Dam TypeRE
Primary Purpose(s)R
EAPY
Dam Height53 ft
Max Storage (ac-ft)2050.00
Surface Area (acres)48.00
Year Completed1935
NID NumberSD00026
River NameJAMES RIVER TRIBUTARY
Latitude43.2617
Longitude-97.6167
Year Modified
1996
Regulatory Agency(ies)DENR
Incident Time
Incident Duration
Incident Report Produced
Information SourcesSD Dam Safety
