it cut a channel through the “bedrock” under that bottom road on the right
I noticed that when they were shutting it down, it started spilling onto some dirt on the left that hadn’t been eroded yet. Thus, the muddy water.
I think that for now, they might want to build up the fall area and just let it use the new eroded channel but with a limited flow of 50,000 tops. Now that all the soft stuff is out of the way, that would be a possible temporary solution until after the spring melt season.
Also, being able to run the plant will help lot in getting water out of the reservoir. I thought I had read that at peak, it can pull almost 17,000 g/s of water out, but they keep saying like 14,000 or 15000. Maybe because one generator appeared to be out for maintenance in the one photo.