Here is a link to the river gauge in that area:
Brazos River Gauge Looks like it's slowing down. It was about 6 feet above normal.
I've been there when it's 2 feet above normal and we could do 7mph without paddling. That was after waiting for it to drop 3 feet. Someone forgot to close the gate on a Saturday morning.
Some weekends you'll find a couple of groups of up to 20 canoes. I know, I am in one.