Great trip report SBD. i was up two weeks ago and spent about two hours in the dark taking every dirt road garmin suggested to dead ends before i finally made it into Masten around 11pm. hiked to the Rock Run/Yellow Dog Run confluence and camped; then the next day was just too stinkin hot so i hiked back to the car. i plan to return in September to do the whole loop. can't wait.
for everybody contemplating this one here is a video of the Rock Run pools that shows the beautyosity of that particular spot: