You can contact GROF as well:
Some general patterns that are always worth trying are Hare's Ear Nymphs and Pheasant Tail Nymphs. Try size 14-16 for now maybe. They can imitate a lot of different sorts of nymphs. Partridge and Orange wet flies in size 14-16 might be worth a shot too. BWO is likely your best bet this time of year for dries, but take a look at some hatch charts online. I'd guess we're behind a typical hatch schedule by a week or two this year, but I have no way of quantifying that right now.
As for open season, pretty much anywhere between Shand Dam and Hwy 86 can be accessed, but default to using single barbless hooks, and don't try to keep anything. There are a few sections where you can use barbed hooks and keep fish, but they're pretty few and far between.
Good luck and share some pics - even if there aren't any fish. It's beautiful along that stretch of river and scenery is always welcome!