Colo. Rev. Stat. § 37-31-147
If the majority of the votes cast is "Bonds - Yes", the board of directors shall issue negotiable coupon bonds of the district. Bonds shall bear interest at a rate or rates such that the net effective interest rate of the issue of bonds does not exceed the maximum net effective interest rate authorized, payable semiannually, and shall be due and payable serially, either annually or semiannually, commencing not later than three years and extending not more than twenty years from date. The form and terms of said bonds, including provisions for their payment and redemption, shall be determined by the board. If the board so determines, such bonds may be redeemable prior to maturity upon payment of a premium, not exceeding three percent of the principal thereof. Said bonds shall be executed in the name of and on behalf of the district and signed by the president with the seal of the district affixed thereto and attested by the secretary. Said bonds shall be in such denominations as the board shall determine, and the bonds and coupons thereto attached shall be payable to bearer. Interest coupons shall bear the original or facsimile signature of the president.
C.R.S. § 37-31-147