The Yampa Valley Trail runs from Duffy Mountain to Echo Park. It is completely within the boundary of Moffat County and it hugs the south side of the Yampa River. It was built in the 1980s and marked every 1/4 mile. Its high point is Juniper Mountain. It also traverses Cross Mountain and 12 mile Mesa, before dumping out on The Yampa Bench Road. It is also completely on BLM land. There is a lot of wildlife and very few people on this route.
This route is very runnable. The elevation gain is moderate.
Facebook
TMA 3 Implementation Maps Yampa Valley Trail (blm.gov)