What happened
A float-equipped Cessna 180A was departing toward the northeast from a seadrome measuring 1,400 feet in length. At the time of the accident, the pilot reported that the winds were approximately four knots and the water surface was lightly rippled.
The aircraft had an estimated takeoff weight of 2,813 pounds, which was within the maximum allowable takeoff weight of 2,820 pounds. The pilot noted that the fuel tanks were full, though he stated that the fuel load could have been managed more effectively. During the takeoff roll, the airplane reached 'on step' status normally; however, the aircraft did not lift off the water before striking the bank located at the end of the lake.
According to the operator's handbook for the Cessna 180A, the required water run for these specific takeoff conditions is 1,356 feet.