I started catching every steelhead I did catch on a 8 ft. 5 wt. Then I caught all of my steelhead on a 9 ft 5 wt. Then I got a 9 ft. 6 wt RPL and that's all I use for steelhead in Erie County now. Maybe Conneaut Creek can use a bigger rod, but nothing in PA. However, you could use one of those specialized nymphing rods. I use the 6 wt because it is easier the flop and fling sucker spawn, shot and a floating indicator with the heavier line. You can beat any steelhead on Erie creeks with a 5 wt. if you learned how to beat fish like this.
If you're new, a bit of advice. FIGHT THAT DAMM FISH! When you're trying to get it in, get your rod low, below your waist. Put the butt in your gut and fight with the lower 1/2 of the rod. Once it's done tearing-#censor#, starting exerting your will on the fish, and your will should be to beat the fish and get it in fast. You don't need a heavy rod for this, just use the one you have. You will be much happier with a lighter rod after roll casting a sucker spawn rig with AB shot all day. It isn't the arrow, it's the Indian.
And get up there sooner than later. The last 5 years, I expected November to be better than October, as it usually did. I haven't found that to be true.
Syl