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1934 ?REUMINARY REPORT (,~! iOJ1=CT T.O R.r-\ItC"-_. . .._ r..J ....... .~ _: ;',_._ ." John Martin Reservoir . John Martin Reservoir is a 608,200 acre-ft mainstem reservoir located 58 mi upstream from the Colorado- Kansas State line (fig. I). The reservoir is used for flood control, inigation-water storage, and recreation. Storage of irrigation water in John Martin Reservoir is by agreement between the States of Colorado and Kansas, under the tenns of the Arkansas River Compact. The Arkansas River Compact is an agreement between Colorado and Kansas, signed in 1948, which insures both states will receive their percentage share of Arkansas River flows. The Compact agreemem dictated a wimer and a summer storage period. During the winter storage period of November I to March 3 I, all inflow to the reservoir was required to be stored, with the exception that as much as 100 f2/s could be requested by Colorado water users downstream of the dam. During the remainder of the year. river flow was stored, although Colorado could demand the release of as much as 500 ft3/s of water entering the reservoir and Kansas could demand releases of that part of the inflow between 500 and 750 ft3/s. Provisions were made for the rate of release of stored water. without reference \0 the volume of stored water assigned to each . State. To assure that each State received their share of stored water, release demands had to be made concurremly. Although the Ark3l1sas River Compact was developed to assure that Colorado and Kansas inigators received their legal shares of Arkansas River water, the plan had several problems and was generally unsatisfactory to both States. Following the winter storage season. reservoir storage was typically drawn down to empty or nearly empty very early in the inigarion season. often by the middle of April. Because of the unsatisfactory nature of this oper- ation, a resolution was adopted by the Arkansas River Compact Administration in 1980. This resolution is Com- monly referred to as the 1980 Operating Plan (Arkansas River Compact Administration, 1980). Under the new plan, any water not immediately called for and released to downstream irrigators. is stored in separate storage accoums for the States of Colorado and Kansas. The individual States can call for the release of their stored water independemly of one another. Two other recem changes have been made in the operation of John Martin Reser- voir that affect reservoir storage and discharge downstream from John Martin Reservoir. A 10.000 acre-ft penna- nenr recreation pool was established in 1976, and three irrigation canals have been allowed to store their approved . WWSP Water in John Nlartin Reservoir. Thirty-five percent of the winter water that the three canal companies 14