Colo. Rev. Stat. § 37-95-111
Any pledge of revenues, moneys, funds, or other property made by the authority shall be valid and binding from the time when the pledge is made; the revenues, moneys, funds, or other property 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, contract, or otherwise against the authority, irrespective of whether such parties have notice thereof. Neither the resolution nor any other instrument by which a pledge of revenues, moneys, or funds is created need be filed or recorded, except in the records of the authority.
C.R.S. § 37-95-111