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Interstate Compacts, Decrees, Memoranda, and Treaties Governing Colorado’s Rivers


This memorandum provides information about the interstate compacts, Supreme Court decrees, and international treaties that govern Colorado’s use of interstate streams. Specifically, it gives a brief summary of the history of each of the compacts and outlines the specific components and requirements of each compact currently in state law. In addition, the memorandum discusses the two memoranda, the two Supreme Court decrees, and the two international treaties that govern rivers in Colorado. Appendix A outlines the technical components of the laws affecting Colorado’s rivers.

The effective date for bills enacted without a safety clause is August 7, 2024, if the General Assembly adjourns sine die on May 8, 2024, unless otherwise specified. Details