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pn,Cjf' U d ,~~_, ~ 't Table 5 - Summary of Water Treaty, Compacts and Court Decrees, Missouri River Basin Affected Affected Item States Subbasins General Principles Treaties International U.S. (Montana) Upper Missouri Apportions waters of St. Mary and Milk Rivers equally Treaty and Great Britain between U.S. and Canada; major developments subject (Canada) to International Joint.Commission. Interstate Compacts Belle Fourche South Dakota, Western Dakotas Established apportionment ot direct diversion and River Compact Wyoming storage; limits construction and operation of dams and reservoirs. Big Blue River Nebraska, Kansas River Apportionment of interstate flows of the Big Blue and Compact Kansas Liltle Blue Rivers and affected ground waters. Republican River Colorado, Kansas River Allocates a given quantity, in acre-feet, for consumptive Compact Kansas, use to each State based on average virgin supply. Nebraska South Platte Colorado, Plalte-Niobrara Apportions the waters of this stream to the two States; River Compact Nebraska maintains stateline flow during specific periods of time. Yellowstone River Montana, North Yellowstone Allocates unused and unappropriated waters of four Compact Dakota, Wyoming tributaries for storage and direct diversions; affects future construction and regulation. Upper Niobrara Nebraska, Platte-Niobrara Allocation of unused and unappropriated waters for River Compact Wyoming storage and direct diversions; also affects ground water for potential apportionment thereof. Upper Colorado Arizona, Colorado, Platte-Niobrara Equitable division and apportionment of the use of water River Compact New Mexico, of Upper Colorado River between the five upper basin Utah, Wyoming States. Transbasin diversions presently made to the Missouri River Basin. Colorado River Colorado, Platte-Niobrara Apportions the waters of the Colorado River blitween Compact Wyoming, the upper and lower basin States; transbasin diversions Arizona, presently made from the Colorado River Basin to the California, Missouri River Basin. Nevada, Utah, New Mexico Interstate Decrees Laramie River Wyoming vs. Platte-Niobrara Limits aggregate diversions in Colorado and those for Colorado, 1922 transbasin diversions; also post-July 31 diversions, and (amended 1932, Wyoming is entitled to remaining flow. 1936, 1940, 1957) North Platte Nebraska vs. Platte-Niobrara Limits irrigated acreage, total annual storage and River Wyoming and out-of-Basin diversions in Colorado; irrigated acreage, Colorado, 1945 total annual storage and apportionment of natural flow (amended 1953) with Nebraska in Wyoming. Provisions are made also for use of Federal storage located in Wyoming on Wyoming and Nebraska land under contracts. Source: MBIAC Framework Study Report 31