This page was incredibly helpful in providing information on what to expect. There has been many hours worked providing crossings of the many creeks and rivers, and I only got wet once. The Downs Fork bridge was great, but the river has overrun it's banks and it will never be the same. So you will most likely get wet at that point. But other than that, in late fall, you can cross all other streams using logs people have laid down.
Trip report on my blog is here: https://summitsofthestates.wordpress.com/2014/07/27/gannett-peak-wyoming-49/
Tried Gannett from the Glacier Trail in 2013, not enough snow left on the glacier to summit since we were too late in the summer. Success a bit earlier in the summer of 2014 for a great, exhausting climb for state highpoint #49. Mosquitoes and intense creek crossings on approach.
Four day RT climb via the Glacier Trail with Dale Carley. Long, but beautiful hike to this tough mountain. Had fun rock climbing and with glacier travel. Most of the people I met were with guides and had horses to carry their gear. Abundance of wildflowers, the spectacular Dinwoody Creek, and moose, mule deer, and other wildlife. Will definitely return to this mountain.
This was a long and tiring hike, but reaching the summit was amazing; this was my first time using crampons and climbing snow - what a fun experience!
This was the single-most challenging, exciting, and rewarding mountaineering trip I have had until now. I would have to guess that the Glacier Trail is a grind for most hikers. This is definitely the second-most difficult State Highpoint to summit, without question. I have a lot of respect for my climbing partner, who made the difficult decision to quit his ascent when within 800'-900' elevation from the summit and already beyond the bergschrund, because he had a nagging injury. It takes a strong person to turn around after going through so much and getting so close. I wanted to turn around and end my summmit attempt to help him down the mountain, but because I was already past the "most technical" portion of the climb he pressed me to continue to the summit and then I caught up to him during the descent. The successful summit, my 39th State Highpoint achieved, felt empty without my partner with me, but then I was glad to have spent the remainder of the trip trying to give him first-aid and improvisational assistance. He couldn't walk out the 21 miles from our high camp, but fortunately we found an outfitter who took him out the final 16 miles via horseback (while I hiked it solo). This trip will be in my thoughts forever.