There are many dams with fish ladders or even fish cannons.
Fish ladders and fish cannons do not work very well. https://e360.yale.edu/features/blocked_migration_fish_ladder...
> fish cannons
It's absurdly funny/weird/scary
https://www.youtube.com/watch?v=eGzdOpCisnQ
alt Hacker News
Fish ladders and fish cannons do not work very well. https://e360.yale.edu/features/blocked_migration_fish_ladder...