Billy Goat Trail, Mesa County, Colorado Mesa Colorado USA According to William McHarg Ela, whose ancestors were perhaps the first pioneers in the Little Dolores River area, the Billy Goat Trail was built as an alternative to traveling on Jacob’s Ladder (a rough, slickrock portion of Little Park Road) to and from Glade Park. Billy Goat Trail started near the base of the current Serpent’s Trail, but went through No Thoroughfare Canyon, up the side of the canyon, and then to the rim. Towards the rim, the builders installed pipes in the sandstone and “walks” in order to build up the trail. yes yes