Colo. Rev. Stat. § 37-33-108
When the works have been completed and accepted by the board of directors, the board shall determine the total cost, damages, and other expenses and divide the same among the several tracts of land affected in proportion to the number of acres in each tract of land or according to the benefits received at the discretion of the board of directors of the district and shall certify to the county assessor, or assessors if such improvements are located in more than one county, a list of the lands affected and the total amount to be assessed against each tract. The assessor, or assessors if such improvements are located in more than one county, shall enter such assessment against each of the several tracts of land lying within his county in the same manner as other taxes, and the county treasurer of each county where such improvements or part thereof is made shall collect the same in the same manner, at the same time, and receipt for same in the same manner as other taxes for irrigation district purposes, and all moneys collected for and on account of such improvements shall be by said county treasurer credited to the general fund of such irrigation district.
C.R.S. § 37-33-108