What happened
While approaching Cedar Lake for landing, the pilot of a float-equipped aircraft encountered light to moderate turbulence. The pilot estimated surface winds were from the south at 20 to 25 knots.
During the final approach north of the lake, the aircraft was maintaining an airspeed considered adequate for a floatplane landing when the right wing dropped abruptly to an angle of nearly 90 degrees. Although the pilot managed to level the wings, the aircraft continued to roll abruptly into a left bank, resulting in an inverted position. The pilot was able to level the wings a second time; however, the aircraft subsequently flew through a wooded area and impacted the ground on shore. At the moment of impact, the aircraft was in a wings-level, nose-low attitude.