I've noticed that there is a large variation in upland game populations from year to year. I went 3 years in a row - floated it twice and jet boated the last time. Every trip was in early November so others will have more experience. None were dedicated upland trips, we were primarily deer hunting but after you get a buck you need something to do. I'd be curious to hear from others but I haven't seen to many sharptail right on the river, once you get up above the breaks I see more of them - and often around and landing in trees. This pattern likely has something to do with the time of year. However, two years ago appeared to be a good hatch and I saw sharptails and huns right on the river, often flying across the river to escape. I actually don't see many pheasant but I also don't try to hard for them.
The rabbit population seemed to tank rather rapidly through those years.
There is the occasional turkey flock, especially lower down. I've never seen turkeys that stupid. I watched a Prairie Falcon fly down from a cottonwood and proceed to pluck a living turkey while the entire flock just stood there. I walked up and the falcon flew away and the turkey was able to live another day.
One year we hit the waterfowl migration perfectly and it was pretty incredible.
If you are also interested in waterfowl your timing might want to be later than if you are mostly after sharpies, huns, and pheasant. If I were going for upland/waterfowl combo I would go in mid-late October. I don't like the heat but every-time we've gone it's been frigid the entire trip with the river freezing up, and the day we leave warms up to the 50s-60s. So plan for any weather.
Planning to bring dogs?