Colo. Rev. Stat. § 44-32-707
In the event any county or municipality development revenue bonds are issued in reliance on the provisions of this article 32, the state of Colorado does hereby covenant and agree with the holders of any such bonds that the state will not limit or alter the rights or powers of the owners of the bonds or to repeal, amend, or otherwise directly or indirectly modify this article 32 or the effect thereof as to the assessments, fees, charges, pledged revenues, or any combination thereof in such a manner as to impair adversely any such outstanding bonds, until all such bonds have been paid and discharged in full or provision for their payment and redemption has been fully made. The covenant and agreement may be included in any agreement with the holders of the bonds.
C.R.S. § 44-32-707
This section is similar to former § 12-60-706 as it existed prior to 2018.