Colo. Rev. Stat. § 23-15-119
A sufficient amount of the revenues derived with respect to a facility, except such part of such revenues as may be necessary to pay the cost of maintenance, repair, and operation and to provide reserves and for renewals, replacements, extensions, enlargements, and improvements provided for in the resolution authorizing the issuance of any bonds or notes of the authority or in the trust agreement securing the same, shall be set aside at such regular intervals as may be provided in such resolution or trust agreement in a sinking or other similar fund which is hereby pledged to and charged with the payment of the principal of and the interest on such bonds or notes as the same become due and the redemption price or the purchase price of bonds retired by call or purchase as therein provided. Such pledge shall be valid and binding at the time the pledge is made and thereafter until satisfied, and the rates, rents, fees, charges, and other revenues or other moneys so pledged and thereafter received by the authority shall immediately be subject to the lien of such pledge without any physical delivery thereof or further act; and the lien of any such pledge shall be valid and binding as against all parties having claims of any kind in tort or contract or in any other form against the authority, irrespective of whether such parties have notice thereof. Neither the bond resolution, any trust agreement, any other agreement, nor any lease by which a pledge is created need be filed or recorded except in the records of the authority. The use and disposition of moneys to the credit of such sinking or other similar fund shall be subject to the resolution authorizing the issuance of such bonds or notes or to such trust agreement. Except as may be otherwise provided in such resolution or such trust agreement, such sinking or other similar fund may be a fund for all such bonds or notes issued to finance facilities at a particular educational institution or cultural institution without distinction or priority of one over another; except that the authority in any such resolution or trust agreement may provide that such sinking or other similar fund shall be the fund for a particular facility at an educational institution or a cultural institution and for the bonds issued to finance a particular facility and, additionally, may permit and provide for the issuance of bonds having a lien with respect to the security authorized which is subordinate to other bonds of the authority, and, in such case, the authority may create separate sinking or other similar funds with respect to such subordinate lien bonds.
C.R.S. § 23-15-119