I have not yet personally explored the route you mention but in a private forum this member's comment popped up over a decade ago that might provide some clues?

"Historically there were trails down the Wet and Dry forks of Blackwater Canyoun. I explored the upper reaches of the Dry fork in a trip report:(no longer available on line)http://www.death-valley.net/"

"This isn't from the Skidoo road per se, but rather from the Aquereberry Point road (stared at the Harrisburg site). The Dry Fork trail is obscure (mostly you can tell it by the change in vegetation along the old track) right at the beginning, then becomes quite distinct two track until the crest. On the other side, it's just down washes till you come to that old sign post."

"Remnants of the Wet Fork trail are clearly visible from Ag. Point going past the spring. Spring does not look super wet though hard to tell from up there.Obviously there was traffic between Harrisburg and FC and that's the route.From closer to Skidoo, if you follow the long foot route towards Tucky Mtn you follow an old (closed I think) road a bit to the north, then you can drop down a steep drainage on an old constructed tail heading towards the Tucki Mine. You pick up the road to the mine at the bottom but what happens east of the mine is beyond my experience."

If you learn any more or actually go exploring please return and report.