Note that this is NOT W7O/CC-021 - Old Blue or W7O/SC-066 - Old Blue Mountain.
When approaching from BLM Road 10 off of Highway 35, Old Blue Mountain, near Marys Peak, is gated and posted as private property. It appears that the peak itself may be on public lands, but the access from the south passes through Weyerhauser timberland.
There may be other access on other roads that approach from another side of the peak.