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Re:Costa Rica has gone 76 days using 100% renewable electricity by dragontamer on Friday September 09, 2016 @01:43PM (#12464426)
Every dam worth a damn has fish ladders.

https://en.wikipedia.org/wiki/Fish_ladder

Poorly built dams can damage the environment. Except you know, its 2016 and we've figured out how to preserve the environment while providing clean energy now.

Re:Costa Rica has gone 76 days using 100% renewable electricity by mastax on Friday September 09, 2016 @03:16PM (#12465263)
The wikipedia article links to this: 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.