Found this video on the NEFGA.org website, despite waiting 2 months for approval of a membership on their site...

Dangerous Lowhead Dams are cause of Deaths to Canoe, Swimmers, tubing and Kayak - YouTube

I never fished around these, but i do remember seeing some as a kid. Often wondered about wading through them for fishing as a kid, especially when they were only a few feet deep. I never realized there was a trough that the water flowed into and a lip that prevents it from being washed out. makes a lot of sense and i can definitely see the danger of being caught in that.

That being said, thought I would share it for those who fish or canoe around such dams.