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within the Dawson-Arkose, Denver, Arapahoe, or Laramie-Fox Hills formation located out- side the boundaries of any designated ground water basin that was in existence on January 1, 1983; Section 37-90-103(6)(a), C.R.S. (1985 Supp.). Designated ground water basins may be determined by the Colorado Ground Water Commission pursuant to section 37-90-106, C.R.S. (1973 & 1985 Supp.) if the ground water contained therein meets the above definition, regardless of whether the ground water is tributary or nontributary. Designated ground water is subject to a modified system of prior appropriation. Section 37-90-102(1), C.R.S. (1985 Supp.). The Commission manages each designated ground water basin in accord- ance with policies developed for the particular basin. Manage- ment responsibilities may be shared with local management dis- tricts. Sections 37-90-111, 118 to 135, 140, and 141, C.R.S. (1973 & 1985 Supp.). Although the 1969 Act does not apply to designated ground water, common law principles of prior appropri- ation have been held to apply interstitially where the 1965 Act is silent.114/ V. INTERSTATE AND INTERNATIONAL STREAMS Colorado contains the headwaters for many interstate and several international streams. The majority of these streams are subject to international treaties, interstate compacts or interstate de- crees. Any time you are dealing with water from one of these interstate/international streams, it is important to be aware that Colorado may have an obligation to deliver a portion of those waters to downstream states and that the treaty, compact or decree may limit the use of waters from that stream. In this sense, interstate/international agreements can place a "call" on the stream requiring Colorado water users to stop taking water so that it may be made available to uses in downstream states. The following is a tabulation of the present interstate/international compacts, treaties and decrees affecting use of water in Colo- rado: A. International treaties 1. Mexican Treaty on Rio Grande, Tiajuana and Colorado -18-