Colo. Rev. Stat. § 37-24-103
The board of directors has the power to construct the works across any watercourse, street, avenue, highway, railway, canal, or ditch which the route of such drainage system or any branch thereof intersects or crosses. If any railroad company, or the owners and controllers of said property, thing, or franchise so to be crossed, or the owner of land necessary for said drainage district, and the board of directors cannot agree upon the amount to be paid therefor, or the points or the manner of said crossings, the same shall be ascertained and determined in all respects as is provided by law in respect to the taking of land for public uses, by the exercise of the right of eminent domain, which right is hereby conferred on drainage districts.
C.R.S. § 37-24-103
For eminent domain proceedings, see articles 1 to 7 of title 38.