C.R.S. § 17-26-123

It is the duty of the keeper of each county jail to receive into the jail every person duly committed thereto for any offense against the United States, by any court or officer of the United States, and to confine every such person in the jail until he is duly discharged, the United States paying all the expenses of the confinement, safekeeping, and custody of such person, including the keeper’s fees, at the rate established by the board of county commissioners of the county where such jail is situated.