At Redding.. Lower Sacramento (on your list) - watch the flows.. it can get ripping through there depending on the snow pack - if you're wading.. 10,000 cfs is probably the highest I'd go.. but there's spots where it's ok higher than that. THE FLY SHOP® - FLY FISHING EQUIPMENT, GUIDE SERVICES, AND INTERNATIONAL FLY FISHING TRIPS
After Redding, the turnoff to Hat Creek and the Pit River aren't that far (head towards Burney on 299).. Fall River a little further
Above Lake Shasta...
Upper Sacramento.. lots of places there.. May will depend on runoff. But From Sims Rd all the way to Ney Springs can be great.. and lots of places to fish to get away from people. Dunsmuir: Ted Fay Home
And the McCloud is off H-89... Nature Conservancy stretch is worth a hard look.
And just south of the Oregon Border, on I-5, the Klamath might be worth a look..