The recent funnel cloud that touched down in the mountains near Idaho did look awesome in the videos below but didn’t seem terrifying to those recording it.
A national park isn't someone's personal picnic spot. The proper way to enjoy these wonderful animals is to keep a safe distance back and not set chairs and other belongings out in areas that are known to have large amounts of animals wandering and tourists walking.
Hells Canyon scenes were used in place of the Snake River, in which Eastwood and Bridges were attempting to board the Idaho Dream mail boat at one point in the movie.