C.R.S. § 30-5-172: Yuma.

(1) The county of Yuma is hereby established, with the same legal capacities and functions as other counties of this state, and the boundaries are as follows:

Beginning at the northeast corner of Washington county; thence running west along the north line of Washington county to the range line between ranges forty-eight and forty-nine west of the sixth principal meridian, in said Washington county; thence south along said range line to the south line of Washington county; thence east along said south line of Washington county to the southeast corner of Washington county; thence north along the east line of said Washington county to the place of beginning.

(2) There is hereby stricken from the county of Adams, formerly a part of Arapahoe county, and annexed to the county of Yuma, all that territory now a part of Adams county described as follows:

Beginning at the northeast corner of Adams county, thence west along the north boundary of said county to the range line dividing ranges forty-eight and forty-nine west; thence along said range line to the south boundary of said county; thence east along the south boundary of said county to the southeast corner of said county; thence north along the eastern boundary of said county to the place of beginning.