Earlier quoted context omitted.
Yep. A couple of girls got killed in Pittsburgh a few years back. They were kayaking down the river and didn't realize a dam was ahead. People die all the time in nature for lack of preparedness because they don't know the environment they are getting into and they don't know their limitations. This also endangers rescuers.
Practical Engineering has a video on the dangers of a lowhead dam - https://youtu.be/GVDpqphHhAE
Watched this video a year later and it made me think... how deep was that water, and was it really as calm as it seemed? Yikes.