In the diversion and storage of water for any project or any parts thereof constructed under the authority of the Colorado River Basin Project Act [43 U.S.C. 1501 et seq.] or the Colorado River Storage Project Act [43 U.S.C. 620 et seq.] within and for the benefit of the State of Colorado only, the Secretary is directed to comply with the constitution and statutes of the State of Colorado relating to priority of appropriation; with State and Federal court decrees entered pursuant thereto; and with operating principles, if any, adopted by the Secretary and approved by the State of Colorado.