MOON LAKE DAM - SC01800-3131
Dam Name: MOON LAKE DAM
State: SC
Downstream Hazard Potential: H
Incident Type: Non-Failure
Incident Date: 06/01/2018
Incident Driver: Deterioration or Poor Condition
Incident Mechanism 1: Spillway Erosion/Head cutting
Incident Mechanism 2
Incident Mechanism 3
Incident IDSC01800-3131
Incident DescriptionA late spring storm apparently caused severe head cut erosion at the downstream end of the auxiliary spillway. Spillway erosion occurred sometime in the Spring of 2018 - exact date is unknown. County imagery shows the headcuting just starting around 3/8/2018 and Google Earth imagery shows highly progressed headcutting by 6/3/2018. The Department became aware of headcutting in late June 2018 when very little dam crest remained to prevent a breach.
Named Hydrologic EventN/A
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 $)
ResponseThe State issued an Emergency Order to require the dam owner immediately lower water level under direction of a licensed Professional Engineer, submit a detailed investigation by a licensed Professional Engineer, and submit a Plan of Action for the repair
Volume released at failure (ac-ft)
Additional Remarks or Updates
Owner TypeP
Dam TypeRE
Primary Purpose(s)PR
EAPY
Dam Height22 ft
Max Storage (ac-ft)74.00
Surface Area (acres)7.00
Year Completed1969
NID NumberSC01800
River NameTR-SOUTH TYGER RIVER
Latitude34.9828
Longitude-82.2257
Year Modified
Regulatory Agency(ies)SC DHEC
Incident Time
Incident Duration
Incident Report Produced
Information SourcesSC Dam Safety
