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A Regional Modeling Framework of Phosphorus Sources and Transport in Streams of the Southeastern United States

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

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

Additional information describing phosphorus loads and delivery maps
by Ana Maria Garcia, Anne B. Hoos and Silvia Terziotti

Article and supplemental material

Online Decision Support System--
Informing Nutrient Management Decisions

The regional nitrogen and phosphorus SPARROW models have been incorporated into an interactive, online decision support system so water managers, researchers, and the general public can access  SPARROW models and map predictions of long-term average water quality conditions, track transport to downstream receiving waters, and evaluate management source-reduction scenarios. (More Regional Models)


Model Predictions (3.12 MB) for instream phosphorus load and yield for 8,028 stream reaches and 293 shoreline reaches in the southeast, and the fraction of instream phosphorus load that is delivered to the basin outlet.

Model Input Data

The data assembled to support model calibration are available in the following reports:

Terziotti, S. and others, 2010, Mapping watershed potential to contribute phosphorus from geologic materials to receiving streams, southeastern United States; U.S. Geological Survey Scientific Investigations Map 3102, 1 sheet.

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:

Ana Maria Garcia

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