On 07/21/13, at approximately 5:50 P.M., Operator was operating his parent''s boat with his parents and cousins  on board. Operator was operating in Slyvan Slough on the Mississippi River. He was traveling from the West to the East exiting the Slough.  During normal water conditions an old lock wall that runs parallel to the river bank is visible.  The water conditions were high, so the wall was not visible.  Operator turned the vessel from Eastbound to the North and proceeded slowly North. The vessel came to a rapid stop as it ran aground on the submerged wall.  None of the passengers were ejected, all remained seated. The vessel sustained damage to the lower unit of the motor and the bottom of the vessel where the bottom of the boat and the stern meet. Operator and his father began checking the the lower compartments and discovered they were taking on water.  subject radioed boater in distress and Iowa DNR''s reponded.  DNR was able to get everyone onto his boat and to shore safely.  DNR advised all of the passengers were wearing their P.F.Ds and the had all of the required safety equipment as required by law. Iowa DNR Officer also responded and contacted Illinois DNR.  CO was able to obtain a written statement from Operator (see attached). I (CPO) arrived on scene at 7:45 P.M.  I went with CO and DNR to get GPS coordinates, photos, and to see if we could remove the vessel.  We were able to tow the vessel so shore and help the owners get the boat back on the trailer.
Moline