Colo. Rev. Stat. § 37-5-113
Before receiving the assessment record, the treasurer of each county in which lands or other property of the district is located shall execute to the conservancy district a bond with at least two good and sufficient sureties, or a corporate surety company, the cost of which shall be paid by the district in a sum not less than the probable amount to be collected by him, and which he may have in his custody for the district at any one time, during any one year, the amount of which said bond shall be fixed by order of the district court based thereon, conditioned that said treasurer shall, as provided in this article, pay over and account for all assessments so collected by him. Said bond after approval by the board of directors shall be deposited with the secretary of the district who shall be custodian thereof, and who shall produce the same for inspection and use as evidence whenever and wherever lawfully required to do so.
C.R.S. § 37-5-113