RedactedNarrative: Unit 1 was traveling east on Lake Marion from Ballards Cove towards Mill Creek at approximately 25mph near the Old Bridge in Santee.  Unit 1 collided with an old bridge pylon that stands alone.  There were five occupants onboard, one was ejected  in the collision, the other four remained in the boat but were injured.  The boat was damaged on the starboard bow and hull area.  All occupants received medical treatment.