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Spatial Analysis of Instream Nitrogen Loads and Factors Controlling Delivery to Streams in the Southeastern United States using Spatially Referenced Regression on Watershed Attributes (SPARROW) and Regional Classification Frameworks

Maps of SPARROW Model Estimates of Total Nitrogen Loads and Delivery to River Basin Outlets, Estuaries, Bays, and Sounds in the Southeastern U.S. (Click desired area for report)

nitrogen loads Tennessee Mobile East Mississippi West Mississippi Pensacola Apalachicola Suwannee Tampa Altamaha Savannah Edisto Santee Winyah Cape Fear Pamlico Albemarle

Additional information describing nitrogen loads and delivery maps
by Anne B. Hoos and Gerard McMahon

Article and supplemental material

Technical Announcement


Model Predictions (4.13 MB) for instream nitrogen load and yield for 8,028 stream reaches and 293 shoreline reaches in the southeast, and the fraction of instream nitrogen load that is delivered to the basin outlet.

Model Input Data

The data assembled to support model calibration are available in a separate report:

Hoos, A.B. and others, 2008, Data to support statistical modeling of instream nutrient load based on watershed attributes, southeastern United States, 2002, U.S. Geological Survey Open-File Report 2008-1163, 50p. Supporting data include watershed and reach level attributes for nutrient sources and transport for 8,028 stream reaches and mean annual nitrogen and phosphorus load, detrended to 2002, at over 750 stream monitoring sites throughout the southeast.

Related Links:

For additional information on the study, please contact:

Anne Hoos
U.S. Geological Survey
640 Grassmere Park, Suite 100
Nashville, TN 37211

Victor Roland
U.S. Geological Survey
640 Grassmere Park, Suite 100
Nashville, TN 37211

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