The pilot of the float-equipped airplane reported that, during a landing on a glassy river, as he was rolling the wings level, he felt the left float touch the water. The airplane yawed to the left, went up the river bank, and slid on the tundra.
The airplane sustained substantial damage to the left wing lift strut.
The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.