Colo. Rev. Stat. § 37-48-130
The board of directors also has the authority to enter into contracts or other arrangements with the United States government or any department thereof, with persons, railroads, or other corporations, with public corporations, with the state government of this or other states, and with irrigation, drainage, conservation, conservancy, or other improvement districts in this or other states for cooperation or assistance in constructing, maintaining, using, and operating the works of the district or for making surveys and investigations or reports thereon. It may purchase, lease, or acquire land or other property in adjoining states in order to secure outlets or for other purposes of the subdistrict and may let contracts and spend money for securing such outlets or other works in adjoining states.
C.R.S. § 37-48-130