RedactedNarrative: Boat A was traveling south across Lake Poygan heading towards Captain’s Cove.  As Boat A approached the Captains Cove at what was described as a high rate of speed.  Boat A's operator backed off the throttle but was unable to steer the boat to avoid a collision.  After the boat had struck the dock in front of Captain's Cove, the operator of the boat learned that a loose rope had gotten entangled in the prop of the boat.  The rope was so bound into the prop that the operator was unable to shift or steer the boat.  After the crash the rope was freed from the prop of the boat and the boat was removed from the area by the operator prior to the arrival of Law Enforcement.  While investigating the crash there was evidence on the boat supporting the information provided by the operator about mechanical issues due to the rope, also found no capacity plated located on the boat.