20th century Mississippi River

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formation of atchafalaya river , construction of old river control structure.



project design flood flow capacity mississippi river in thousands of cubic feet per second.


until 1950s, there no dam below lock , dam 26 @ alton, illinois. chain of rocks lock (lock , dam no. 27), consists of low-water dam , 8.4-mile-long (13.5 km) canal, added in 1953, below confluence missouri river, bypass series of rock ledges @ st. louis. serves protect st. louis city water intakes during times of low water.


u.s. government scientists determined in 1950s mississippi river starting switch atchafalaya river channel because of steeper path gulf of mexico. atchafalaya river capture mississippi river , become main channel gulf of mexico, leaving new orleans on side channel. result, u.s. congress authorized project called old river control structure, has prevented mississippi river leaving current channel drains gulf via new orleans.


because large scale of high-energy water flow threatened damage structure, auxiliary flow control station built adjacent standing control station. $300 million project completed in 1986 corps of engineers. beginning in 1970s, corps applied hydrological transport models analyze flood flow , water quality of mississippi. dam 26 @ alton, illinois, had structural problems, replaced mel price lock , dam in 1990. original lock , dam 26 demolished.



a low-water dam deepens pool above chain of rocks lock near st. louis (2006)



soldiers of missouri army national guard sandbag river in clarksville, missouri, june 2008, following flooding.








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