The area effected by the proposed site C is extremely miniscule, as compared to the original dam on the Peace at Hudson's Hope. The original dam MASSIVELY changed the landscape, even having an effect on climate.
Now, to see things in prospective, set your Google Earth at +56 -122 14 and punch the search button. When Google Earth stops, adjust the magnification so the original dam is a bit above the hand and the yellow line of highway 97 is somewhat to the right in the picture.
With your eye, just follow down the Peace River to the right, past the canyon dam, until you come to highway 97. Site C will be built just a couple of miles before the Peace crosses the highway.
Thus, the area effected by the dam will be the valley from below the canyon dam until almost to highway 97.
Now, without changing the magnification of Google Earth, start moving the hand west, to your left, along the lake formed by the original dam. Keep it going, until the lake spreads out greatly, both to the north and to the south. follow the lake to the north, then return and go south to the south end of the lake. This is the lake formed by the Bennett dam. Besides the two main rivers that formed the Peace, the Finlay and the Parsnip, the lake flooded the lower reaches of eleven waterways designated as rivers.
Maybe now you can reduce the magnification of Google Earth, until the entire Williston Lake and highway 97 is visible on the screen. The tiny distance from the original canyon dam, below the start of Williston Lake and highway 97 will be the land effected by the building of Site C. The distance looks pretty small, doesn't it, as compared to Williston Lake?
The land to be flooded includes good, valley farm land, which has been owned for a long time by farmers, at least one of which was the home ranch of a major guiding operation. However, I understand the privately owned farm land has been bought out by the province for some years now.
In short, the flooded area that will effect wintering areas for big game is actually pretty minor.