Fishing is pretty good, but the water is running high at 3000cfs. It's still wadable, but you need to be careful. Having a PFD and wade stick are good things, as well as a tightly sinched wading belt.

I talked to Jude yesterday and he said with the flows, you can go bigger with size, so 20s, even 18s in some places. But for mid-march, midges, eggs, worms, leeches. Things like this will work. You will also need lots of weight! Talking BB size split to get the flies down quick.

If you have never fished the river, a guide would be a good thing to look into. Like AKA said, Jude is a good choice. I've known him for 8 years and he knows that river well.

Also, bring warm clothes. mid-march can be cold one minute with blowing snow and mid-60s the next minute. so, be able to layer yourself with clothing.