Colo. Rev. Stat. § 30-5-130
The county of Hinsdale shall be bounded as follows:
Commencing at the point of intersection of the ninth correction line north with the New Mexico principal meridian, and running thence north along said principal meridian to the southern boundary of Saguache county; thence westerly along the southern boundary of Saguache county to the one hundred and seventh meridian of longitude west from Greenwich; thence north along said meridian to a point ten miles north of the thirty-eighth parallel of north latitude; thence west to a point due north of a point six miles west of the mouth of Lost Trail creek, on the Rio Grande river; thence south to the point of intersection with the ninth correction line north; thence east along said correction line to the place of beginning.
C.R.S. § 30-5-130