Just back from the Devil Mountain 50k out of Pagosa Springs CO yesterday. We had a good time, finished in 8:18, the course wasn't extremely difficult, but did have a 3,000 ft. climb up to about 10,000 ft - that was the tough part. I'd say it was about 30-40% dirt road and jeep roads, the rest some pretty technical single track trails. Kindof a low key event, we like those. My quads and calves are a bit sore today.....
http://www.joingecko.org/images/pdf/DM50kElev2011.pdf