Where is there an example of a river dammed that has been able to sustain it's native salmon population?  The answer is nowhere.  They are tearing these things down and spending boatloads of money trying to restore devastated salmon populations (ie. Columbia).  Mrs. McGregor points out how few salmon spawn above the dam but she neglected to mention that a dam of this magnitute ( 700 feet high) would drastically change flow rates year round.   In the winter, when energy needs are higher, opening the flood gates turns the river's normal cycle upside down making it hard for juvenile salmon to overwinter and survive.   I'm skeptical when someone tells me that the salmon will be just fine when, to date, there is no shining example of a that to point to.  Let's drop this thing once and for all.  There are better things to spend our money on.