RedactedNarrative: The operator was attempting to enter in Bigfork Bay, going against the current of Swan River.  The area is a No Wake zone.  This waterway is a narrow channel with the Hwy 35 bridge piling in the center  The boat was approaching the  channel under the Hwy 35 bridge.  An fisherman was on the shore (Witness).  The driver pulled back the throttle.  The current began pushing the boat toward the piling.  The driver increased his speed and steered the boat away from the piling.  the boat crossed the channel and the prop hit some submerged rocks on the shore line, which did significant damage.