i hope you have a better season than we downunder are having. what is classed as a good sized salmon up your way. ours would be 15 - 20lbs. of course a few years ago 30lbs was the norm. do you catch them on a fly or spinners. spinners would be our top method. mind you our salmon rivers tend to be glacier fed and quite braided and fast flowing.sorry if it sounds like '20 questions' but its always interesting to know how others fish.
An average summer fish (grilse) would be about 6lb-8lb, spring and Autumn fish are around 10lb-14lb (I've witnessed many in this size range). These are conservative figures because I have heard of a lot of fish up to 25lb but never seen them with my own eyes.

I prodominantly fish with the fly, my preferred way. Died shrimp have been banned on the water for a fair few years now (to many fish being caught on it). At least with the fly you can fish artificial shrimp patterns. I don't care if I catch a fish or two, just like standing in a river with a nice rod in hand taking in the sights and sounds.
If the water is running too high to get into I bring the spinners out (Devon minnows and black and copper flying C's) fishing them as if they were a fly. The worm is a very popular meathod also.