Colo. Rev. Stat. § 30-20-627
When the local improvements specified in the preliminary order referred to in section 30-20-603(5) and specified in the resolution authorizing the improvements have been completed and any debt incurred or bonds issued have been paid, the board shall take all steps necessary to dissolve the district and, upon completion of such steps, shall declare, by resolution, that the district is dissolved; except that this requirement does not apply to a district formed for the purposes authorized in section 30-20-603 (11.5). Upon dissolution, any moneys remaining to the credit of such district that have not been transferred to a special surplus and deficiency fund as permitted in section 30-20-619(3) may be used for any county purpose as determined by the board, including, without limitation, the reimbursement to the county of any county moneys spent to provide any portion of the costs of the local improvements completed within the dissolved district.
C.R.S. § 30-20-627