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RIO GRANDE COMPACT (§37-66-101, et. seq., C.R.S.) March 18, 1938 Signatory States: Colorado, New Mexico, and Texas Colorado Commissioner: State Engineer Major Purposes: 1. To remove all cause of present and future controversy between the states concerning the waters of the Rio Grande above Ft. Quitman, Texas (Preamble) 2. To promote interstate comity (Preamble) 3. To effect an equitable apportionment of the waters of the Rio Grande above Ft. Quitman, Texas (Preamble) Important Provisions: 1. Rio Grande Basin means all of the territory drained by the Rio Grande and its tributaries in Colorado, New Mexico and Texas. 2. The Commission shall cause to be maintained and operated, among others, the following stream gaging stations: (Art. II) a. Rio Grande near Del Norte above the principal points of diversion to the San Luis Valley b. Conejos River near Mogote c. Los Pinos River near Ortiz d. San Antonio River at Ortiz e. Conejos River at its mouth near Las Sauses f. Rio Grande near Lobatos g. Automatic water stage recorders on all reservoirs constructed after 1929, as well as stream gaging stations below such reservoirs. Colorado is obliged to deliver at Lobatos the sum of the amounts set forth in the delivery schedules for the Conejos River and the Rio Grande less 10,000 acre-feet. The Conejos Index Supply includes the San Antonio River and Los Pinos River flows for the months April through October. These schedules require zero delivery for an index of 100,000 acre-feet, up to 68% delivery for an index of 700,000 acre-feet on the Conejos, and 30% delivery for an index of 200,000 acre-feet, and up to 60% delivery for an index of 1,400,000 acre-feet on the Rio Grande (see attached graph). (Art. III) 4. If the Closed Basin is used for delivery of water to the Rio Grande, the water must contain no more than 45% sodium ions in the total positive ion count when total dissolved solids exceed 350 ppm. (Art. III)