Anybody ever heard of this place? I just checked out their website. Looks like they've got 5 acres of dirt jumps built on their own property. It's in La Center, WA a few miles north of Vancouver but I couldn't find an actual address or directions to get there. They say on their website everyone is welcome and show pictures of some mountainbikes jumping.
http://groups.msn.com/DirtyBoogerDirtParkBMX/_whatsnew.msnw
http://groups.msn.com/DirtyBoogerDirtParkBMX/_whatsnew.msnw