Colo. Rev. Stat. § 31-25-1215
The board, in certifying annual levies, shall take into account the maturing indebtedness for the current and ensuing year as provided in its contracts, maturing bonds, and interest on bonds and the deficiencies and defaults of prior years and shall make ample provisions for the payment thereof. In case the moneys produced from such levies, together with other revenues of the district, are not sufficient to pay punctually the annual installments on its contracts or bonds and interest thereon and to pay defaults and deficiencies, the board, from year to year, shall make such additional levies of taxes as may be necessary for such purposes, and, notwithstanding any limitations, such taxes shall be levied and shall continue to be levied until the indebtedness of the district is fully paid.
C.R.S. § 31-25-1215