Colo. Rev. Stat. § 30-26-506
Any pledge of revenues, moneys, funds, or other property made by a county pursuant to the provisions of this part 5 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 such county shall immediately be subject to the lien of such pledge without any physical delivery thereof or further act. 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 county, irrespective of whether such parties have notice thereof. Any resolution or any other instrument by which a pledge of revenues, moneys, or funds is created shall be filed or recorded with the county.
C.R.S. § 30-26-506