RedactedNarrative: Vessel 1 struck an unknown pier on the Fox river near Johnsburg in McHenry County.  Vessel 1 received a hole/damage to the starboard stern.  Vessel was cruising on plane until reached Pistakee Lake, then when it came off plane, the hole went below the waterline and the vessel took on water.  The vessel was towed to shore by Chain of Lakes personnel.  The operator was arrested for OUI.