One question -- if it's above the falls, is it really a wild fish spawning issue?

I'm a huge fan of protecting our rivers and fish, but choices are hard about how to get the power we need. Dams which are upriver of waterfalls seemed at least worth considering?
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The charm of fishing is that it is the pursuit of what is elusive but attainable, a perpetual series of occasions for hope. -John Buchan