Just to add an alternate route if you don't have an Inland Empire Paper permit.
There is a gated access road that starts at the same Blanchard Hump parking area as previously mentioned.
Follow the road upwards which has quite a few switchbacks so the distance uphill is more like 2.75 miles OW.
The road is part of Hancock Timber IX and is posted for non-motorized access only. Partway up, the land ownership transitions to WA DNR for most of the rest of the way to the top.