Is the Mississippi delta a swamp?

The Delta was swampland, with rivers and streams flowing through it and the Mississippi River flooding each spring. Wetlands in the Delta offer extensive water resources and a natural river pathway to support an “avian superhighway” for countless migrating birds.



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The Mississippi River Delta is a river-dominated delta system, influenced by the largest river system in North America. The shape of the current birdfoot delta reflects the dominance the river exerts over the other hydrologic and geologic processes at play in the northern Gulf of Mexico.

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For 7,000 years, the Mississippi River has snaked across southern Louisiana, depositing sediment from 31 states and 2 Canadian provinces across its delta. As sediment accumulated under water, plant communities began to develop, trapping more sediment and building land.

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One big difference between the two is that while the Nile delta is shrinking (the Mediterranean Sea is eating away more sediment than the river can supply), the Mississippi delta is growing. The image below shows the growth of the Mississippi delta over the past 10,000 years.

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Some of the mammals found in the California Delta include the beaver, river otter, muskrat and shrew. These mammals generally live in riparian habitats, where they build dens and burrows and hunt or forage for food.

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Humans have upset the delicate balance of land gain and loss in the Mississippi River Delta. Dams, levees and channels along the Mississippi have prevented land-forming sediments from reaching the delta, and most of those that do are discharged deep into the Gulf of Mexico.

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