The wikipedia article links to this: http://e360.yale.edu/feature/blocked_migration_fish_ladders_on_us_dams_are_not_effective/2636/ http://e360.yale.edu/feature

The wikipedia article links to this: http://e360.yale.edu/feature/blocked_migration_fish_ladders_on_us_dams_are_not_effective/2636/ http://e360.yale.edu/feature/blocked_migration_fish_ladders_... Not exactly a glowing recommendation. It seems a lot like those 'nature bridges' over highways that animals never use. A nice idea if it worked, but they don't.