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Differences in Phosphorus and Nitrogen Delivery to the Gulf of Mexico from the Mississippi River Basin

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Locations of monitoring stations used in USGS modeling

map

The USGS network of monitoring stations available for use in the USGS model was about 425 stations. Unfortunately, surface-water quality monitoring has declined significantly over time, declining from 425 stations in the early 1990s to about 35 stations today that have comparable nutrient data and stream flow measurements.

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