RedactedNarrative: Unit 1 struck bottom and rocks while crossing a shallow area. Unit 1 hit in the area that a hazard marker was missing. One hazard marker was still in place and one was missing. Operator reported to scdnr that his boat, documented vessel feerish had struck bottom and damaged his prop and out drives. Upon reviewing Operator, he told me that he was in the newberry county area of murray on saturday may 17th. He told me that he slowed down to an idle to approach the bridge at dreher island state park on the south western side at approximately 1215 hours. Operator told me that he had been under the bridge a couple of times before and knew that the water was shallow near the bridge. He also told me that he passed one hazard marker to his left as he was idling towards the bridge. Operator stated to me that he had his out drives trimmed up a little because he knew that the water was shallow but he had passed to the right of the shoal in the past and had not hit bottom. I drove to the area where the boat hit bottom and took gps coordinates to the right of the shoal in the past and had not hit bottom and depth readings. I noticed one hazard marker on the outer end of the shoal but the hazard marker that use to be on the bridge side of the shoal was missing. Operator indicated to me that this was the area that he hit the rocks and bottom. I could see large rocks and the bottom in this area as i drove over it and the epth dwas 2.9 feet on my depth finder. i then took picture of the damage to the boat prop on. Operator boat and talked to the mechanic that Operator was going to use to do the repairs.