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U.S. Geological Survey personnel collecting a water quality sample at the Missouri River at Hermann, Missouri in July, 2011. Photo by Kelly Brady, USGS

Nitrate in the Mississippi River and its tributaries, 1980 to 2008: Are we making progress?

By Lori A. Sprague, Robert M. Hirsch, and Brent T. Aulenbach

Article and supplemental material in Environmental Science & Technology

Press Release

Nitrate Trends

• Mississippi River at Clinton, IA
• Iowa River at Wapello, IA
• Illinois River at Valley City, IL
• Mississippi River below Grafton, IL
• Missouri River at Hermann, MO
• Mississippi River at Thebes, IL
• Ohio River near Grand Chain, IL
• Mississippi River above Old River Outflow Channel, LA

For additional information on this study, contact:

• Lori Sprague (lsprague@usgs.gov)
  
• Robert Hirsch (rhirsch@usgs.gov)

Related Links:

• Mississippi River Gulf of Mexico Watershed Nutrient Task Force
• Trends in Nutrient and Sediment Concentrations in Streams and Rivers of the United States, 1993-2003
• Nutrients in rivers, streams, and aquifers in the United States
• Annual and Spring Estimates of Nutrient Delivery to the Gulf of Mexico from the Mississippi River Basin
  

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U.S. Department of the Interior | U.S. Geological Survey
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