As we were crossing the Sierras the other day, looking down at gorgeous high-mountain lakes, the question arose as to what the highest altitude seaplane operations were. After looking and not finding anything, I decided to start a discusion.
Last spring we landed on Lake Mary, south of Flagstaff, AZ in a Grumman Widgeon. The elevation was 6830' MSL and the length of the landing area was about 2 miles.
Anyone know of any higher operations?