Up here in the headwaters, the rivers are all still over flood stage, but are supposed to start dropping this week. They had dumped a ton of water out of Fontenelle and Flaming Gorge to make space for the runoff, but I think they are now reducing the flows and allowing the reservoirs to fill up. So, I would bet flows have peaked, but will remain strong for a while.
That said, there is still a of water to come down. We went hiking into the Wind River Mountains last week, there is still a ton of snow over 9500 feet, so you can't really get anywhere. They were predicting an active monsoon season for the summer, that would be icing on the cake of a huge water year up here.