See complete attached State Parks Accident Narrative.  (This is only an excerpt, space allowed in this form is too small.)

Cache Dispatch received an emergency call that a person was trapped under a boat at the dock at Hyrum State Park. Further information revealed that the boat was out on the lake and the person was caught in the propeller underneath the boat with his head barely out of water. Responding emergency agencies were able to extract the patient from the propeller and transport him to shore to a waiting ambulance.

Witness statements from the operator and passengers on board the boat indicated that two people had fallen off a tube being pulled by the boat. Both individuals being pulled by the boat on the tube were wearing personal floatation devices. As the boat operator came around to pick up them up he pulled in between the two riders in the water. He stated that he normally has the riders get back on the tube then be pulled back into the boat. As the operator was slowly moving in between and past the riders, through a turbulent wake/ wave area, TUBER1 decided to swim to the boat and get back in. As he reached the back of the boat he attempted to climb on the wooden swim deck to lift himself up into the boat, while the boat was still moving forward. The operator stated that he was unaware that TUBER1 was attempting to board the boat. Interviewed family members indicated that TUBER1 had a type of crippling leg disease since he was a child, causing him to frequently have easily broken legs and resulting in one leg looking deformed. For this reason he was wearing pants to cover the appearance of his leg deformity. Witness described that his pants were athletic style pants that were too long for him, as he is 500 tall and the pants were made for someone 600 tall. As tuber1 began to lift himself onto the swim deck his legs floated under the swim deck and his pants were quickly caught and twisted into the moving propeller. The position of the propeller on this inboard motorboat was located underneath the boat and to the rear. A metal frame is built around the propeller area to protect it from damage. As TUBER1S legs were caught into the prop he began to yell to stop the boat that his legs were caught. The operator immediately turned the key off, killing the motor. The operator stated that he was unaware that TUBER1 was attempting to board the boat. Witness statements indicate that a subject jumped in the water to hold his head out of the water until help arrived and that one person also swam over to help. 911 was immediately called. 

 After interviewing the passengers and reviewing their witness statements I believe that the injuries that TUBER1 received in this accident were an unfortunate accident and that there has been no criminal act committed on the part of the operator. Better communication between the designated boat observer, the operator, and the swimmer would have allowed the operator to turn off the motor or position the transmission in neutral and thus avoid the accident. I also believe that extra long pants being twisted around the propeller contributed to the occurrence of the accident.
Hyrum                         