I believe its more useful to look at flow rate, instead of megawatts, when looking at wadeability.
I have always felt 0 - 2000 cfs is "wadeable" meaning can stand in water up to my waist and fish and move around in water thats flowing that much. This applies to ANY moving water. But even then, usually I'm going to be standing in water no more than knee deep and fishing into deeper water.
2000 - 4000 is wadable if I'm in just up to the shins, or more likely fishing from the bank or islands. Any more flow than that your lure/fly is moving so fast you don't get much of a presentation. Above 4000 cfs its time to fish from the boat.
The formula is 66 cfs per mwh on the White (26000 / 391.) So today's 190 mwh = 12,540 cfs. No way you can wade on that.
Learn to think in terms of flow rate, it is useful for any river, anywhere.