RE: need info on Grays Harbor wild pig hunt...
I'd try up the Wynoochee valley, and not to step on your toes Slee, but I have been on their trail up that way, tracks an scat and rooting areas. They are up in the logging land up towards the dam, but it's a good hike(4-6) miles up past the gates. My Cousin's wife teaches in Monte. and she hears from her students about hunting them all up through that valley.
As of last I heard , they are Feral hogs that are not wanted by the WDFW to be in the wild, there's no bag limit, no season, and as far as I would guess you should be able to bait them and possibly even hnt at night. Baiting is only illegal for bear and big game, these pigs are a nuisance and the WDFW wants them gone ...period. Night huntin I beleive is also legal, just not during any of the big game seasons, especially Modern. But I'd still ask the WDFW for clarifications.