What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The pilot in command of a wheel equipped airplane, was conducting a maneuver popularly known as water skipping to an off airport landing site/river side gravel bar. His intent was to land on the water short of the gravel bar, then roll up onto it and stop. However, the PIC allowed the airplanes wheels to penetrate the rivers surface too deeply. The resulting high drag and rapid deceleration forces caused the airplane to rotate forward and over, ultimately coming to a stop on its nose, partially submerged in the river. Note: the NTSB noted but did not investigate this event. Consequently it did not assign an NTSB id number to it.
As the FAA filed it
THE PILOT IN COMMAND OF A WHEEL EQUIPPED AIRPLANE, WAS CONDUCTING A MANEUVER POPULARLY KNOWN AS WATER SKIPPING TO AN OFF AIRPORT LANDING SITE/RIVER SIDE GRAVEL BAR. HIS INTENT WAS TO LAND ON THE WATER SHORT OF THE GRAVEL BAR, THEN ROLL UP ONTO IT AND STOP. HOWEVER, THE PIC ALLOWED THE AIRPLANES WHEELS TO PENETRATE THE RIVERS SURFACE TOO DEEPLY. THE RESULTING HIGH DRAG AND RAPID DECELERATION FORCES CAUSED THE AIRPLANE TO ROTATE FORWARD AND OVER, ULTIMATELY COMING TO A STOP ON ITS NOSE, PARTIALLY SUBMERGED IN THE RIVER. NOTE: THE NTSB NOTED BUT DID NOT INVESTIGATE THIS EVENT. CONSEQUENTLY IT DID NOT ASSIGN AN NTSB ID NUMBER TO IT.