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I I I I I I I I I I I I I I I I I I I o'&tJls 8 . Three Standard Metropolitan Statistical Areas with a combined 1975 population of 792,800, are located within the Middle Missouri Subbasin. The three, Omaha, Nebraska-Iowa (572,900), Sioux City, Iowa-Nebraska (120,000), and st. Joseph, Missouri (99,700), collectively constitute 60 percent of the total subbasin population, and 86 percent of its total urbqn population. Approximately 2,200 native American Indians live in the subbasin. Highly variable out migration and return migration rates among Indians complicate accurate estimates of demographic data for this group. In 1975, about 36 percent of the total population or 471,000 persons were employed. Of this total, only 12 percent or 56,200 persons was engaged in agriculture. This figure has continually declined over the last few decades. Employment in nonagricultural economic pursui~s has, however, enjoyed a continued rise. Approximately 415,000 persons, or 88 percent of the work force are employed in nonagricultural sectors. Total employment is projected to reach 586,900 persons, an increase of 25 percent over the 1975 level, by the year 2000. Agriculture is the dominant land use in the subbasin but the major use of water is for thermal electric power generation. Other major water uses include municipal and industrial and irrigation. Depletions to streamflow within the subbasin are relatively low, totaling only 232,000 acre-feet in 1975. This level is expected to increase to 430,000 acre-feet by the year 2000. However, withdrawals total nearly 10 times depletions due to large diversion for once-through cooling at several steam-electric plants located along the Missouri River. The 1975 average annual outflow from the subbasin, measured at Kansas City, Missouri, was estimated to be about 28 million acre-feet. Remaining . 8-5