Dating pictures of Minnehaha Falls is an imprecise art. The images themselves, as well as the physical objects–the photographs–offer little clues. Mostly, no one wrote the dates on these pictures, so assigning a date means putting together these little clues, and doing research, and then making best-guesses.
It’s a fine view of the falls, but the waterfall is slightly hidden behind those tree branches. And for every subsequent picture taken from this viewpoint, the branches have been cut away, as you can see.