Colo. Rev. Stat. § 30-26-405
The interest accruing on such refunding bonds issued pursuant to the provisions of this part 4 prior to the time when tax levies are available therefor shall be paid out of the general revenues of the county, and, for the purpose of reimbursing such general revenues and for the payment of subsequently accruing interest, the board of county commissioners issuing such refunding bonds or the proper tax-assessing and tax-collecting officers upon whom shall devolve the duty of levying and collecting county taxes shall levy annually a sufficient tax upon all the taxable property in the county fully to discharge such interest, and, for the ultimate redemption of such refunding bonds, they shall levy annually such a tax upon all the taxable property in such county as will create a fund sufficient to discharge each annual installment of such refunding bonds at the maturity thereof, which fund shall be called the redemption fund. All taxes for interest on and for the redemption of such bonds shall be paid in cash only and shall be kept by the county treasurer as a special fund to be used only in payment of the interest upon and for the redemption of such bonds, and such tax shall be levied and collected as other county taxes are levied and collected. The tax provisions for the ultimate redemption of such bonds shall be set forth in the resolution authorizing their issue and shall set forth the years in which such taxes shall be levied for the creation of said redemption fund.
C.R.S. § 30-26-405