I actually went and checked out a couple of the skamania mines by the west fork washougal river. The last chance mine, which is the largest, was completely collapsed, but bushwhacked up an abandoned road to the yellowjacket mine, where we peeked into the entrance. Also, I think the Mabee mine and the blackjack mine are even further up that abandoned road, which looks like it leads to the SW side of Bluff mountain.
This forum is used to share your experiences out on the trails.
You can. My dad did that in the 80's. It should be easier now because a recent steelhead recovery project cleaned out a massive log jam from Bluebird Creek just above it's confluence with the river.
https://www.wildsteelheaders.org/scienc ... gal-river/
However, between Prospector Creek and Bluebird creek the Washougal flows through a slot canyon and has to be swum. I took an old road South from the waterfall on Prospector Creek down to where it crosses the Washougal and comes up by an old cabin. Most of that area was recently logged (it is private property, but not posted) so you can see the old road grade in satellite views.
From the old cabin at 45.72725521198424, -122.13181425660373, you can follow a road NE. It has a Y intersection that heads back into the Bluebird Creek valley. From there it degrades, but it wasn't nearly as bad as the ox-cart road that runs on the East side of shirt creek to the mines.