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SPARROW tracks nutrient delivery locally   to the outlets of inland watersheds and   regionally to coastal waters. Differences   in phosphorus yield in the Mississippi   River Basin shown above are caused by   local and regional differences in phos-   phorus removal in streams and reservoirs   during transport [Read more about these   and other SPARROW results]   Related Links:   NAWQA Home Page   NAWQA Nutrients Synthesis Program   NAWQA Modeling and Software   Coastal Hypoxia Research Project   Denitrification Research Coord. Network   SPARROW Workshop: October 2002   SPARROW Internal Web Page

RECENT ACTIVITIES Rankings of watershed nutrient yields in the Mississippi/Atchafalaya River Basin SPARROW Fact Sheet SPARROW Major River Basin (MRB) Studies Phosphorus and nitrogen delivery to the Gulf of Mexico from the Mississippi River Basin Dissolved solids in streams of the Southwest: Sources and sinks APPLICATIONS The National Models Phosphorus and nitrogen delivery to the Gulf of Mexico from the Mississippi River Basin Moving from Monitoring to Prediction: The Quality of the Nation's Streams Natural background concentrations of nutrients in U.S. streams Atmospheric sources of nitrogen to major U.S. estuaries Effect of stream channel size on nitrogen delivery to the Gulf of Mexico Sources of nutrients in the Nation's streams (model predictions for HUC watersheds) Nutrients in the Northeastern United States Regional total nitrogen and phosphorus models The role of headwater streams in downstream water quality New England SPARROW data viewer New England Interstate Water Pollution Control Commission (NEIWPCC) U.S. Environmental Protection Agency Region 1 Project Nutrients in the Chesapeake Bay Watershed Application of the national models A regional nitrogen model Models for the late 1980s and the 1990s WATERSHED DATA FOR THE APPLICATIONS Hydrologic cataloging unit watersheds River reaches of the conterminous U.S. - USGS Enhanced River Reach File: version 2.0 (ERF1-2) version 1.2 (ERF1); Stream water-quality measurements (on-line; CD-ROM) Municipal and industrial point sources Fertilizer use Livestock nutrient wastes Atmospheric deposition Population - Census of Housing and Population National Resources Inventory (NRI) Soil characteristics - State Soil Geographic Data (STATSGO) Precipitation and air temperature

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