What a day! This is a loop, so you could really start anywhere. We chose Armstrong Gulch and went clockwise. We started and ended in headlamps, piecing together a loop with Sterling Mine Ditch trail, Jack-Ash trail, and a little bit of dirt roads. There were several places where we had to use our gps apps (and a paper map!) to pick the right direction at intersections. Twice we screwed up, once accidentally adding on the entire Hidden Creek Loop Trail! We hit a few stretches of snow, but mostly had a beautiful day with crazy views from Anderson Butte of the Red Buttes and Siskiyous. We packed in water/gels/snacks but noticed several running creeks (prob will be dry in a few months). Running this in the Spring or Fall would be ideal.
Huge thanks to Siskiyou Upland Trails Assn for completing Phase 1 of the Jack-Ash loop!