Are you familiar with the Gordon bay landing, just below lock 9? Does the river freeze well there?
I was looking through the river maps and the red can line right there looks like a good spot to fish if the ice is good. Just upstream of there on the other side of the river there is a side cut. There should be a hole in the main channel just outside that cut. I would check there too.
That is my two cents just from looking at a map. I have never been there in person.