Colo. Rev. Stat. § 31-20-306
The collector shall make a written report to the governing body, or any officer designated by it, of all moneys collected by him, the account whereon collected, or of any other matter connected with his office when required by the governing body or by any ordinance of the town or city. He shall also annually, by March 1 after the close of the fiscal year, file with the clerk a statement of all moneys collected by him during the year, the particular warrant, special assessment, or account on which collected, the balance of moneys uncollected on all warrants in his hands, and the balance remaining uncollected at the time of the return on all warrants which he returned during the preceding fiscal year to the clerk. The clerk shall publish or post the same as required to be done by section 31-20-304 in regard to the annual report of the treasurer.
C.R.S. § 31-20-306
This section is similar to former § 31-20-310 as it existed prior to 1975.