B section little hole to browns park, grasshopper with a small nymph dropper underneath. The fish here get a little less pressure so you can bump up to a size 20. Also try crane fly patterns with a small nymph chaser, put them about 18 inches apart. And gain fish them right on the bottom.
I have not fished the C section in a long time, so refer to the earlier post
Good luck! I wil be there too from the 4th on.
If you're going to fish the lower sections you need to do your homework well in advance so you're not wasting time getting to the access(es) and then getting to the specific areas you want to fish.
Carry some drinking water 'cause it's damn hot, and enjoy whatever you decide to do!
I think in either case you'll find some good fishing in that section of the river.
Good luck, Ryno