What happened
The pilot landed the airplane on a lake to pick up two hunters. During the loading process, a snow shower moved into the area, causing visibility to drop from 3 miles to less than 1/4 mile. After about five minutes, the snow shower ceased and visibility improved to 5 miles.
The pilot decided to proceed with the takeoff. Upon inspecting the aircraft, the pilot brushed his hand against the tail surface and observed that the snow removed easily. No further snow removal was performed on the rest of the aircraft. During engine start, the pilot observed that the snow had blown off the tail and assumed that the remaining snow would clear from the rest of the airframe during the takeoff roll.
As the aircraft lifted off the lake surface, it failed to climb above an altitude of 5 feet. The pilot attempted to abort the takeoff, but there was insufficient room to stop the aircraft before it collided with the shoreline.