JONES LAKE DAM - SD00758-3405
Dam Name: JONES LAKE DAM
State: SD
Downstream Hazard Potential: H
Incident Type: Non-Failure
Incident Date: 06/13/2019
Incident Driver: Unknown
Incident Mechanism 1: Sinkhole
Incident Mechanism 2
Incident Mechanism 3
Incident IDSD00758-3405
Incident DescriptionThe conduit spillway of the dam's two primary spillways had a sinkhole with seepage develop around it on the downstream side.
Named Hydrologic Event
EAP Enacted (Y/N) due to IncidentYes
Fatalities (Number)0
Number of People Evacuatedunknown
Number of Habitable Structures Evacuatedunknown
Number of Habitable Structures Floodedunknown
Other Infrastructure Impacts
Economic Damages (in $)
ResponseThe county emergency manager notified residents downstream of the dam of the situation. The owner used pumps to lower the water level and put a temporary berm across the conduit inlet.
Volume released at failure (ac-ft)
Additional Remarks or UpdatesA very wet spring and early summer likely contributed to the issue. A permanent repair was done in Fall of 2019.
Owner TypeS
Dam TypeRE
Primary Purpose(s)R
EAPY
Dam Height21 ft
Max Storage (ac-ft)1260.00
Surface Area (acres)101.00
Year Completed1938
NID NumberSD00758
River NameTR-JAMES RIVER
Latitude44.4783
Longitude-98.9467
Year Modified
2000
Regulatory Agency(ies)DENR
Incident Time
Incident Duration
Incident Report Produced
Information SourcesSD Dam Safety
