What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Pilot took-off from a private airstrip. Just as he was retarding throttle transistioning to cruise the aircrft began to shake. The shake got quickly worse and the pilot retarded the throttle further and attempted to return to the airstrip. When the pilot saw he could not make the strip he attempted to add throttle but the vibration got worse. The pilot retarded the throttle and looked for the best place to land. Due to terrain and trees he decided to land in the columbia river. The aircraft landed in the river approximately 100 yards from shore with no injury to the solo pilot. A passing boat that saw the landing pulled the pilot from the river and helped pull it to shore.
As the FAA filed it
PILOT TOOK-OFF FROM A PRIVATE AIRSTRIP. JUST AS HE WAS RETARDING THROTTLE TRANSISTIONING TO CRUISE THE AIRCRFT BEGAN TO SHAKE. THE SHAKE GOT QUICKLY WORSE AND THE PILOT RETARDED THE THROTTLE FURTHER AND ATTEMPTED TO RETURN TO THE AIRSTRIP. WHEN THE PILOT SAW HE COULD NOT MAKE THE STRIP HE ATTEMPTED TO ADD THROTTLE BUT THE VIBRATION GOT WORSE. THE PILOT RETARDED THE THROTTLE AND LOOKED FOR THE BEST PLACE TO LAND. DUE TO TERRAIN AND TREES HE DECIDED TO LAND IN THE COLUMBIA RIVER. THE AIRCRAFT LANDED IN THE RIVER APPROXIMATELY 100 YARDS FROM SHORE WITH NO INJURY TO THE SOLO PILOT. A PASSING BOAT THAT SAW THE LANDING PULLED THE PILOT FROM THE RIVER AND HELPED PULL IT TO SHORE.