C.R.S. § 33-11-110

The commission may establish uniform signs and markers, which signs and markers may include appropriate and distinctive symbols. Where trails cross lands administered by federal agencies, such markers may be provided and erected by the appropriate federal agency at appropriate points along trails and maintained by the federal agency administering the trails in accordance with standards mutually established by the division and the federal agency concerned. Where trails cross lands of state or local governmental agencies, the division may provide such uniform signs and markers to such agencies in accordance with written agreements and may require such agencies to erect and maintain them in accordance with standards established in such agreements.