C.R.S. § 37-67-102: When compact binding.

Said compact shall not become operative unless and until the same has been ratified by the legislature of each of the signatory states and consented to by the congress of the United States, in the manner provided by, and in conformity with, said compact, and the governor of the state of Colorado shall give notice of the approval of said compact to the governor of the state of Kansas, to the governor of the state of Nebraska, and to the president of the United States.