That a county to be called Cheyenne, be and is hereby erected, including that portion of territory lying within the following limits: commencing in the main channel of the south fork of the Platte River, where the 104th meridian of west longitude crosses the same, thence north with said 104 meridian of longitude to where the same crosses Lodge Pole Creek, thence west up the main channel of said creek to the summit of the Black Hills; then south upon the summit of said Hills to the north west corner of Heele county, thence east along the north line of said county to its north east corner; thence south to the Cache La Poudre Creek, thence south down the main channel of said creek to its junction with the South Platte River, thence down the main channel of the Platte to the place of beginning.