Hi, welcome to OFF and the moneypit that is steelhead fishing. Sorry to break the news to you but a 5 wt. for winter steelhead will leave your mouth hanging open with drool coming out. I would suggest getting a float rod that is 9.5-10.5 ft in length rigged up with 30-40 lb braid. The rod does not have to be expensive at all, Okuma SST rods are a great rod and deal at around $100. The reel needs to be decent, shimano reels in the $50-$100 range are good. I have always been partial to power pro in moss green. Grab a half dozen floats such as beau macs or my favorite west coast floats in 3/8 oz. jigs are not super cheap but get a dozen 1/4 oz jigs in pink/orange, red/black/white, pink/white, black/purple, or just pink. As far as places to fish around PDX someone else will have to help you with that one. I will probably p$&@ someone OFF but the Wilson river is a great river to fish with lots of bank access and hike in areas. There are very few backpacking areas for steelhead and there are not any salmon outside the Columbia/Willamette this time of year. There are TONS of high lakes to hike in and fish with your 5wt. However, not this time of year they are all frozen over or the banks have 5ft of snow. Hopefully I helped at least a little bit, good luck and feel free to ask any other questions. Good luck and post pictures!