I just moved down from Bozeman and miss Montana quite a bit, you'll love it up there. Since they are doing well with snow, there should be a good runoff. Lots of big water compared to Colorado- many rivers peak around 5,000 or more. You'll have plenty to do up there, the Yaak river is relatively remote and awesome big water IV. The Flathead and it's forks all have great boating, including multi-day trips. The Lochsa is only a few hours away as well as lots of creeking in the Bitteroot and Northern Idaho. If you are able to head down to the Absaroka/Beartooths (about 5 hours away) you will find anything from roadside III/IV (the Gallatin during runoff is a blast, Beartrap of the Madison, Yellowstone,etc.) to multi-day V+ rivers (Stillwater, Clarks Fork of theYellowstone). If steep creeks are your thing you should definitely hit Big Timer Creek in the Crazy Mountains. It drops an amazing 750 ft in a mile and a half (lots of footage in Nurpu). As posted above, the guidebook is well put together and worth the purchase. Also, from what I hear, there are definitely more creeks opening up, it's just a matter of clearing wood debris. Check out the website www.montanasurf.com
- good photos there and I believe you can order the guidebook straight from there. Hope that helps.