The two most recent deaths in Yellowstone, this girl and the young man who drowned have one very important link. They both were doing something that is clearly prohibited. Tubing, rafting, boating etc. is expressly forbidden in ALL the rivers and stream in Yellowstone. All the trails that lead to the overlooks for the falls are clearly marked with multiple signs saying "Stay on the Trails only". Additional signage outlines the dangers associated with not following that simple rule, including warnings potential death. The truly amazing thing is that we don't see more casualties. On any given day you will see dozens of people ignore all the warning signs and do incredibly dangerous things.