Running Eagle Falls, located in Montana’s grand East Glacier Park, was originally home to the Blackfeet Indians, who controlled the vast prairies east of the mountains. The falls are unique in that water rushes over the upper fall so dense that the lower fall is completely hidden in the spring, but by late summer the flow decreases and the water seems to change course and flow almost exclusively out of the lower fall. It’s this unusual behavior which gave Running Eagle its nickname, the Trick Falls. By the early 1800s, French, English and Span. . .