Been fishing 2+ years with Hydrogen 4 wt / 300 commando head and OPST tips (3) depending on flows 8K-17k cfs. RBs and browns 20 in + on olv brn and blk streamers. Have seen only one other TH fly fisher and I put in a lot of half days as live only 2 hrs away in Flagstaff. I fish mostly walkin section and occasionally upriver. Fly fishing GC is a must do just for the scenery.