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Introduction How Rivers Run Stories Value Of A River What We Can Do
From Farmer to Shrimper: The Dead Zone
(pg 3 of 8)

Nutrients, primarily nitrogen, carried by the Mississippi fuel the growth of algae in the inshore areas of the Gulf. Average concentrations of nitrate in the Mississippi and some of its tributaries have increased several times over since the early 1900s. Overall, the amount of nitrogen delivered to the Gulf via the Mississippi has tripled since the late 1950s (mostly from the 1960s to the early 1980s).

These huge increases in nitrogen have fertilized ever larger growths of algae, contributing to larger dead zones.

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Valley Creek
Gulf of Mexico
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