The vessel was southbound on the west bank of Upper Spring Lake on the Mississippi River on plane and traveling 40-45 mph when the rear end of the boat struck a submerged/suspended piece of unknown structure.  The impact caused the vessel to spin to the right starboard side 360 degrees.  After spinning one full rotation, the vessel ran up on to shore completely out of the water onto the muddy bank.  The spin and the impact caused the passenger to hit his left shoulder on the console of the boat.  The passenger was transproted to the hospital.  No damage to the vessel was observed and it was towed into the water and was able to operate back to the boat ramp.
Savanna                       