Colo. Rev. Stat. § 24-90-513
The governing body, 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 library district or facilities 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 governing body, 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 library district or facilities district is fully paid.
C.R.S. § 24-90-513