I'm not the fanciest with electronic gizmos, but the coordinates for Hoodoo Pass are 46.975458, -115.02652080000001
It comes up quite easy on Google maps. From that world famous Pilot station, head along the river on Diamond Rd, which gets renamed Trout Cr/FR 250 for about 25 miles. If you start going downhill, you're in the wrong State, but it's marked.
There's a semi-protected area directly across the road from the actual Pass parking lot, I'm leaning towards that spot, if unoccupied, since there is a little tree buffer from the road. There's a vault toilet about a mile before the top of the pass, I don't recall seeing any at the Pass proper.
I'll have my ham radio on K6YTI (K6yeti), on 146.46, and CB Ch 7, loggers are running that channel in this area.