Hydroelectric projects are generally very good for the environment- and especially so when they replace coal.

Anyone who eats fish must understand that most wild caught fish today are contaminated with mercury.  Mercury gets into fish from the pollution released by the combustion of coal.  Coal is contaminated with many heavy metals, such as lead, mercury, strontium, thorium, uranium and their radioactive isotopes.  Mercury is particularly damaging in that it works its way up the food chain, and is a potent neurotoxin.  Pregnant women are advised to never eat fish.

Overall, reducing greenhouse gas emissions is very good for the oceans- which salmon live in.  CO2 released by burning fossil fuels increases the acidity of the oceans- and kills or injures sea life that depends on calcium carbonate backbones.  If our oceans continue to acidify, we may destroy complex food chains that salmon and other fish must have.

A 5,000 acre lake would be great habitat for trout, and other fish.