I can't speak much for Portland, but we used to have a small group of people up here in Vancouver, WA for awhile but but it seemed to die out. I tried to "run" the league over at Dice Age for awhile and we just didn't have enough regular people and enough of a dispersion of skill levels. I went down to Guardian Games a few times and they seemed to have more - as well as a few other places in Portland.
It's a bummer because Warmahordes was really enjoyable to me, I just couldn't find a big enough regular group to play with. I do know that there are a few guys who still play at Dice Age Games in Vancouver, but it isn't what it was back when I played there regularly a few years back and I think it's every other week on Wednesday.
I think if it had a resurgence Warmahordes would still be my game of choice, but I'm just not sure how a game can get new life breathed into it enough to support a decent population of people playing it.
Edit - I should clarify that this is from a Vancouverite point of view, it isn't always tenable to drive down into downtown Portland and over that bridge for game nights. Towards the end most of my games came from finding specific people and meeting up somewhere local for a game.