EDNA YON DAM - SC00364-3127
Dam Name: EDNA YON DAM
State: SC
Downstream Hazard Potential: H
Incident Type: Non-Failure
Incident Date: 09/12/2017
Incident Driver: Hydrologic/Flooding
Incident Mechanism 1: Insufficient Spillway Capacity
Incident Mechanism 2Accident or Misoperation
Incident Mechanism 3Other
Incident IDSC00364-3127
Incident DescriptionOwners had filled in primary spillway due to leakage at some point historically so that auxiliary spillway is only avenue for flow. Then owners constructed a road across auxiliary spillway with undersized culvert pipes. Permits/approval from the State were not obtained for any of this work. During Hurricane Irma, the road bed washed out causing a sudden, uncontrolled release.
Named Hydrologic EventHurricane Irma
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)R
EAPN
Dam Height17 ft
Max Storage (ac-ft)316.00
Surface Area (acres)40.00
Year Completed1962
NID NumberSC00364
River NameHOLLOW CREEK
Latitude33.6301
Longitude-81.2444
Year Modified
Regulatory Agency(ies)SC DHEC
Incident Time
Incident Duration
Incident Report Produced
Information SourcesSC Dam Safety
