At approximately 2100 hrs, Medic 21 and Ambulance 29 were alerted to assist with a mass casualty incident on Cheat Lake. Mon EMS Captain 404 had EMS and advised a total of 12 patients for transport. Both units from SCEMS transported patients to Ruby Memorial Hospital. Other agencies operating on the scene included Mon EMS, JanCare, Marion County Rescue Squad, Cheat Lake VFD, Brookhaven VFD, Point Marion VFD (PA), HealthNet, Air Evac, Monongalia County Sheriffs Office, and the WV Natural Resources Police. This incident was mitigated very well and all crews returned to service without incident.