We just used wader boots and neoprene socks... all the rivers are ice cold even when its 35+ out but you are not really standing in them,, just crossing... and when you do need to stand in them its almost refreshing!
the area as a whole you need a 4# and an 8# ish ... I almost wanted a 10 on the Wig a couple times.... as far as a gun we use a maverick 88 12ga with 3" Tripple o.... but a 45-70 would probably be more diverse.... but more money too.
you can argue bear defense guns all day and basically be split between a 45-70 and a 18" barrel 12ga with the butt (not pistol grip) ammo for both is a whole nuther debate.... Brenneke slugs,,,000.... whatever it is it must remain on your person.. not for law, but for purpose....

I was literally talking about my adventures over there this morning at work....