The Pheasant Ridge RV resort in Willsonville, Oregon was rated one of the top eight RV campgrounds in the nation by Trailer Life in 2008.
It's a beautiful park with an indoor pool and spa, free WiFi, 20/30/50 amp hook-ups, cable TV, bath and shower rooms, and easy access to I-5. They are really near Camping World and lots of shopping and restaurants. There is also a small on site grocery store.
We stayed here a few months in 2008 and returned in 2009 for a week. We highly recommend this RV Park if you're visiting the Portland area. They do have monthly rates available, so if you're a full time rver and want to stay longer they have an application process.