Colo. Rev. Stat. § 38-44-106
At the time and in the manner specified in the order of court, the commission shall proceed to locate said boundaries and corners and for that purpose may take the testimony of witnesses as to where the true boundaries and corners are located; and, when so ascertained, the commission shall mark the same by erecting or putting down permanent and fixed monuments at all corners so located. In its report to the court, the commission shall file a map or plat showing all monuments, lines, and any other evidences or witness marks that will more nearly identify the corners and, if that issue is presented, shall also take testimony as to whether the boundaries or corners alleged to have been recognized and acquiesced in for twenty years or more have in fact been recognized and acquiesced in. If it finds affirmatively on such issue, it shall incorporate the same into the report to the court.
C.R.S. § 38-44-106
For methods of erecting monuments at corners, see § 38-51-104.