美国密西西比河上游及密苏里河在1993年夏发生了一场罕见的范围广、历时长大洪水。从该年6月中旬到9月中旬，这场洪水成为全国的注意中心，被认为是可与美国历史上六次大自然灾害并列，并和1973年密西西比河下游洪水一起，是各次大自然灾害中影响范围最广、历时最长的。这次洪 In the summer of 1993, an unusually wide range of long-term floods occurred in the upper reaches of the Mississippi River and the Missouri River. From mid-June to mid-September of that year, the flood became the national center of attention, considered as being in line with the six natural disasters in the history of the United States and together with the floods of the lower Mississippi in 1973, The widest impact and the longest period in disasters. This flood