Get out as soon as you can. If you want a guide, I'd try one of the fellas from Sac River Outfitters. I talked to a guy a few days ago that LANDED 13 adult Steelhead with them. Hooked many more.
Junction City area is best bet. Use a drift boat. Try a Copper John or Golden Stone and egg under an indicator or swing a blackleech/bugger/stonefly.
Well I really wasn't planning on using a guide. I dont have a drift boat.
I really dont know alot about the river or its access. Is it easy to access some fishy looking water and wade? Find some parking? Is there long streches of wadeable water. I know it gets crowded but sometimes that's not a bad way to find good areas.