me and a group of friends jumped off the top of a railroad bridge above the Boise river in the mid 70’s to celebrate the first day of high school. It was about 90 feet up. Turns out the pilings of the old bridge were still next to the new bridge. Big 4 by 4 foot square concrete pilings about 3 feet under water. lots of them. We didn’t land on any. Darwin award contestants. (None of us won the award.)
I always investigated before a high dive, there are too many stories of jumping blindly into water.