Basically it's at Mt Saint Helens. Peel off Interstate 5 at exit 49, Castle Rock. Then head East on Hwy 504 through Toutle, then just before Kid Valley, turn right and head SE on South Toutle River Rd. From there you find the Weyerhaeuser 4100 road, take it to the 4200 rd which is on the Left, then it's up in the air from there. This will be my first weekend in that area and the maps I have found aren't very descriptive of the road system once you get off Weyco land and back onto state land.
I plan to be up there this weekend and next, as long as my motor goes together well and the truck gets running tomorrow. If anyone wants to head that way let me know, I'll get more descriptive directions and other important info.