Ditto to Pete. No wading above minimum flow. "40" is one generator, "80" is two. And it comes up in a hurry, you don't want to be caught in the river on the rise. It's quite dangerous.
Check out generation on the White, and learn how long the rises take to get downstream. It's easier to work around pulses in generation there. Can find wadeable water at several shoals at minimum flow or not much above. Even if generation ruins your Norfork plans or cuts your day in half, you can truck over to Wildcat, Roundhouse, up to the dam, etc and salvage your day if flows are low there.
Also, save your pennies and/or find a buddy and hire a guide to fish from a boat for at least a day. That's really the ultimate White/Norfork experience anyway. There are many excellent fly guides on the rivers these days.
Chris