RedactedNarrative: On 6/1/18 at approximately 5:30 PM, a vessel (IL 0313 HK) began taking on water in the Starboard pontoon.  A passenger unhooked the battery when he observed water filling the compartment where the battery was located.  This caused the engine to quit running.  Subject grabbed some rope and jumped in the water in an attempt to pull the vessel towards the bank.   However, he did not tie off the rope to the boat prior to jumping in.  At this time, he was pulled by the current away from the boat and began to become exhausted.  Subject clung to a log until the Rockton Fire Department arrived.  Subject was pulled off log out of river by Rockton Fire.  Subject was suffering from exhaustion, dehydration, and vomiting blood.  He was taken to Rockford Memorial Hospital for treatment and later released that night.