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Neighbors LA PLATA RIVER COMPACT, 1922 The states of Colorado and New Mexico, with the consent of the U.S. Congress, entered into this compact for division of the waters of the La Plata River. According to the agreement, the amounts which may be used vary with the season and the daily flow. LARAMIE RIVER LITIGATION 1957 .... ...,. .._..._.",.~9!!!!!!9y"g~J.9!:!!.c:1.9.~?_~__\!.~"~~t...;,_.;,_,,...,;....... The U.S. Supreme Court decision in this case allocated to Colorado users the right to divert from the Laramie River and its tributaries 49,375 acre-feet of water in each calendar year. Only 29,500 acre-feet of such water could be used within the drainage basins of the Laramie River and 19,875 acre-feet could be diverted for use outside the Laramie River Basin. Wyoming water users have the right to divert and use all water remaining in the Laramie River and its tributaries after Colorado's diversions. NORTH PLATTE RIVER LITIGATION 1954 (Nebraska v. Wyoming 325 US 589, 1954) This U.S. Supreme Court decision divided the water of the North Platte River between the states of Colorado, Wyoming and Nebraska. Under the decision, the state of Colorado may irrigate up to 145,000 acres of land in Jackson County, Colorado, during anyone irrigation season and may store up to 17,000 acre-feet of water for irrigation purposes during the water year. Colorado may also export up to 60,000 acre-feet of water in any period of ten consecutive years from the basin of the North Platte River. The decree contains numerous other provisions concerning the division of water between the states. ARKANSAS RIVER COMPACT, 1948 This compact between the states of Colorado and Kansas and the United States provides operating criteria for the John Martin Reservoir constructed by the Corps of Engineers in 1943. During the winter storage season (November 1 to March 31) Colorado may demand releases of water equivalent to the river flow not to exceed 100 cubic feet per second. During the summer storage season (April 1 ...... .to..october..st).CoJQI<Ido,may.demaRGreleases.of-,. -.....,. water equivalent to the river flow up to 500 cubic feet per second, and Kansas may demand releases of water equivalent to that portion of the river flow between 500 cubic feet per second and 750 cubic feet per second. During the summer storage season, water in storage may be released upon demand by Colorado and Kansas concurrently or separately in amounts dependent upon the magnitude of the storage. With a concurrent demand, Colorado is entitled to 60% to of the release and Kansas 40%. SOUTH PLATTE RIVER COMPACT, 1923 Division of the waters of the' South Platte River is acccmplished by this compact between the states of Nebraska and Colorado and the United States Government. From October 15 until April 1, Colorado has full use of the water of the South Platte River within the boundaries of the state except that the ~ state of Nebraska is entitled to divert some $ 0< "'~ surplus waters if the proposed i;;erkins County '\ {.>o. / Canal is constructed. r I, From April 1 to October 15, if the mean flow ~} ~~ at the interstate stations is less than 120 cubic ~ feet per second, Colorado shall not permit diversions from the lower section of the river to } 7 supply appropriators with dates of priority subsequent to June 14, war. tw1 RIO GRANDE RIVER COMPACT, 1938 This ccmpact involves the states of Colorado, New Mexico and Texas and the United States Government. Colorado's commitment to deliver water at the New Mexico state line is based on runoff measured at four index stations located in the headwaters area of the Rio Grande. This compact provides schedules of required deliveries, for accrual of debits and credits in deliveries, penalties against storage facilities constructed after 1929 based on project storage in Elephant Bulle Reservoir and debit ccnditions. .ltaloo'P!"evides-a.oomplelCformtlla'reglllating.the- .... ........ salinity of the water delivered. COSTILLA CREEK COMPACT, 1963 The Costilla Creek Compact apportions the waters of Costilla Creek (a tributary of the Rio Grande) between Colorado and New Mexicc. Delivery of waters is determined according to a table of water rights combining the priority dates of water rights both in New Mexico and in Colorado. Administration of the compact is handled by the Costilla Compact Commission with both states sharing costs. Page 15