So just south of Stoner then? Was this actually on the RGS grade? there's a couple of miles there where the grade is on the other side of the river from the highway, and then it's still a bit away from the highway, on the river side, the rest of the way to Delores.
Yep, it's rock-rolling season. When I was dating my wife I was heading home form Durango to Gunnison and came 'round a corner on 550 (between Coal Bank & Molas) and found an armchair sized rook in the middle of my lane. I wasn't going very fast, not the 1st rock on the road I'd seen that weekend, so got stopped then went around it. Sure woke me up though (this was about 4 AM).
Hank