What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Pilot attempted takeoff run on the Alabama river in Cessna 206. Pilot noticed that he could not get aircraft airborne and aborted the takeoff run. Engine was functioning properly and no signs of any malfunction. On the taxi back to the dock pilot noticed that the floats were submerged by at least 1 inch indicating water in the floats. Pilot stated that he "stiff taxied" to get the weight on the tail of the aircraft. As soon as he approached his dock and reduced power to idle the floats dug in at the nose and the plane slowly flipped over landing upside down. Pilot had opportunity to open door while slowly flipping and all passengers unbuckled and evacuated the aircraft. The aircraft was then towed by the pilot back to his dock. Plane flipped in about sixteen (16) feet of water and sustained minimal damage other than being submerged.
As the FAA filed it
PILOT ATTEMPTED TAKEOFF RUN ON THE ALABAMA RIVER IN CESSNA 206. PILOT NOTICED THAT HE COULD NOT GET AIRCRAFT AIRBORNE AND ABORTED THE TAKEOFF RUN. ENGINE WAS FUNCTIONING PROPERLY AND NO SIGNS OF ANY MALFUNCTION. ON THE TAXI BACK TO THE DOCK PILOT NOTICED THAT THE FLOATS WERE SUBMERGED BY AT LEAST 1 INCH INDICATING WATER IN THE FLOATS. PILOT STATED THAT HE "STIFF TAXIED" TO GET THE WEIGHT ON THE TAIL OF THE AIRCRAFT. AS SOON AS HE APPROACHED HIS DOCK AND REDUCED POWER TO IDLE THE FLOATS DUG IN AT THE NOSE AND THE PLANE SLOWLY FLIPPED OVER LANDING UPSIDE DOWN. PILOT HAD OPPORTUNITY TO OPEN DOOR WHILE SLOWLY FLIPPING AND ALL PASSENGERS UNBUCKLED AND EVACUATED THE AIRCRAFT. THE AIRCRAFT WAS THEN TOWED BY THE PILOT BACK TO HIS DOCK. PLANE FLIPPED IN ABOUT SIXTEEN (16) FEET OF WATER AND SUSTAINED MINIMAL DAMAGE OTHER THAN BEING SUBMERGED.