Operator was operating the vessel on Lake Michigan just out deep enough from the shoreline when they came to a place near 9 mile point and Big Rock where the shoreline came out and they lost track of water depth.  The vessel struck a rock and damaged the lower unit and outdrive.  The vessel was taking on water through a damaged area along the outdrive.  The bilge was able to keep up with the incoming water.  occupant called 911 to advise and get help.  USCG assisted in getting the vessel off the rocks and secure.
Hayes                         