RedactedNarrative: V1 was traveling south from the mile long bridge down the middle of the lake & was navigating to the Marina at approximately 40 mph.  The drive saw a blinking light which he thought was the center channel buoy going into the marina so he turned left and ran his vessel aground at approximately 40 mph.  There were a total of 3 people on board yet not injuries were reported.  None of the individuals were wearing life jackets & the incident was not reported until the next morning.