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National Water-Quality Assessment (NAWQA) Project
Click on a watershed to access maps of nutrient contributions to an estuary.
Data Tables with estimates of total nitrogen and phosphorus delivered to estuaries draining into the Gulf of Mexico with the percent delivered by major source.
explore the regional SPARROW models online to determine nutrient sources, track nutrient transport to downstream reservoirs and estuaries of interest, and evaluate combinations of nutrient reduction scenarios: