Your jet boat should get you where you need to go. I took a zodiac and 15 horse prop about 6 miles up the river and quit when I got tired of grinding gravel. The jet boats and airboats had no trouble going much further up. I was fishing not hunting at the time.
Your other option would be to fly into Carmen Lake and float out to the hi-way with a raft, but theres no sense in doing that if you have the jet.
I just got back from my elk trip to Colorado and must say that I learned quite a bit about hiking in that one trip. I researched all I could on the internet and thought I was prepared going out. For the most part I was but I want to pass on a few major things I learned that helped me drastically!
1. Pack light. I know this may sound like common sense but believe me. After reading everyone's advice on what you need to pack, chances are your pack will end up weighing more...