It looks like flows are still up. It has been a good season so far for the Lower Saint. Calgary rivers are finally dipping down to end their seasons. That means the middle fork of the flathead may end up as a good alternative for an easier paddle. As someone mentioned, the Swan is an awesome, if continuous ride. THe main fork of the Flathead down by Polson also shouldn't be missed.
OF course the usual standby are the Kootenay runs around Radium and Fort Steele. The lower Elk is also running, even if it may not be a favorite run for everyone. The Bull, especially the canyon is always fun, even at low flows. If you really want good water, consider the creeks by Golden. As most of those are Glacier fed, they tend to get pretty high on warm days.
I will be heading off to Whitehorse next weekend, so won't be around for a while.