RedactedNarrative: Operating south on the main channel of the Mississippi River adjacent to the intersection with Running Sough, near river mile 694.7 in LaCrosse County.  Vessel hit a floating log that caused damage to propeller, strut, and fiberglass hull.  Operator continued south down the river and propeller wore a hole in the fiberglass hull, just in front of the rudder.  Vessel took on water and engine quit while in the main channel near Crater Island.   An off-duty law enforcement officer, assisted in getting the vessel to shore, and took Operator to Lawrence Lake Marine for completion of field sobriety testing.  Operator was arrested for boating under the influence.