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reservoir is storing water, and downward when) in order to accurately calculate the Compact <br />delivery obligation for the Conejos River. <br />Similar adjustments are made to stream flow gages affected by trans-basin diversions into the Rio <br />Grande Basin. Annual storage, releases and evaporative losses by post-Compact reservoirs and <br />Basin inflows from trans-basin diversions are explicitly accounted for the in the Annual Compact <br />Reports. <br />Costilla Creek Compact Administration <br />Costilla Creek originates in the mountains of Colorado just north of the border with New Mexico. <br />From Colorado, Costilla Creek flows south into New Mexico, north back into Colorado and again <br />south into New Mexico where it finally enters the Rio Grande below the Rio Grande Compact <br />delivery measurement point. There are diversions for irrigation from Costilla Creek within both <br />Colorado and New Mexico. Within New Mexico, there are two diversions which carry water to <br />Colorado for irrigation; the Cerro Canal and the Acequia Madre . Note that the Acequia Madre <br />becomes the Cordillera Canal within Colorado. Also, Colorado may carry water diverted by the <br />Acequia Madre through aturn-out to the Mesa Canal. <br />The Costilla Creek Compact was signed in 1944 and amended in 1963. The Compact requires <br />that both Colorado and New Mexico fund a Water Master to administer water rights according to <br />the Compact. Water is administered between the two States such that a specified percentage of <br />divertable flows at several ditches diverting from Costilla Creek in New Mexico is made <br />available to users within Colorado. Additional information concerning administration of the <br />Costilla Creek Compact and water deliveries made to Colorado from New Mexico can be found <br />in a memorandum documentin#; an interview with the Water District 24 Commissioner. <br />Comments and Concerns <br />None <br />Attachments <br />1. Article III of the Rio Grande Compact <br />2. Compact Delivery Curves for the Rio Grande and Conejos River <br />3. 10-day Compact Analysis Worksheet <br />4. 10-Day Compact Report <br />C:\cdss\Div3_Mem2.doc Division 3 Interview June 28, 1999 -Page 8 of 8 <br />