Colo. Rev. Stat. § 37-43-171
Upon the filing of such petition, the district court shall be vested with jurisdiction of the subject matter and shall forthwith ascertain from testimony or other evidence, as nearly as may be, the names and addresses of all the creditors and bondholders, or their counsel or representative, of said district and shall make an order requiring each of the owners of the lands included within the boundaries of such irrigation district, and the legal holders of any indebtedness of such irrigation district, and all persons who may be affected in any manner by such proceedings to appear before such district court upon a certain day, to be designated in such order, not less than twenty days after service of notice of such order, as provided in section 37-43-172, there to show cause why the said petition should not be granted.
C.R.S. § 37-43-171