Colo. Rev. Stat. § 37-4-103
If the appraisers find that land not embraced within the boundaries of the district will be affected by the proposed improvement or should be included in the district, they shall appraise the benefits and damages to such land, and shall file notice in the court of the appraisal which they have made upon the lands beyond the boundaries of the district, and to the land which, in their opinion, should be included in the district. The appraisers shall also report to the court any lands which, in their opinion, should be eliminated from the district; but no territory lying in any county into which any existing district does not already extend shall be included in such district, except in accordance with the provision of section 37-2-105 with reference to the inclusion of land in such counties.
C.R.S. § 37-4-103