Colo. Rev. Stat. § 37-80-118
Any headgate keeper, owner, employee, or other person having charge of any automatic self-registering device installed and operated pursuant to order of the state engineer or a division engineer or compiling gauge height records pursuant to order of the state engineer or division engineer, or any gauge height observer at any river station in this state, installed, maintained, and operated for the purpose of recording the amount of water flowing in said stream, or any reservoir keeper having charge of the keeping of gauge height records on weirs on intakes or outlets of reservoirs who makes false or fictitious reports of gauge heights or who alters, changes, or falsifies any gauge height record or report or who alters or modifies the record made by any automatic self-registering device is guilty of a misdemeanor and, upon conviction thereof, shall be punished by a fine of not more than five hundred dollars for each violation of the provisions of this section.
C.R.S. § 37-80-118