Colo. Rev. Stat. § 37-31-157
In all actions, suits, and judicial proceedings in any court in this state, the court shall take judicial notice of the organization and existence of the district from and after the filing for record in the office of the county clerk and recorder of Mesa county, Colorado, of a certified copy of the order of the board of directors of said district made at the time of the organization of the board. A certified copy of such order shall be prima facie evidence in all actions, suits, and proceedings in any court in this state of the regular and legal formation or organization of said district, and, if the formation or organization of said district has not been questioned by proceedings in quo warranto instituted in the district court of Mesa county, Colorado, within sixty days after the date of filing of such order, it shall be conclusive evidence of its due and lawful formation and organization. The said order shall state that no sufficient remonstrance was filed as in this article provided and that the Grand Valley drainage district was organized.
C.R.S. § 37-31-157