C.R.S. § 38-39-104: Satisfaction of mortgage.

The lien of any mortgage encumbering property within the state of Colorado can be released only by the mortgagee executing a separate instrument of release executed under the formalities prescribed by the law regulating conveyances. All releases made prior to July 1, 1973, either on the mortgage or on the record of the mortgage, and signed by the mortgagee, shall have the same effect as a separate instrument of release legally executed by the mortgagee.