Visualizations of water quality across the conterminous United States using SPARROW 2012 simulated nutrient load estimates
January 13, 2025
This pipeline uses the data from the 2012 regional Sparrow models (see **Input datasets** below) to produce four types of outputs:
1. Maps of SPARROW-estimated total nitrogen, total phosphorus, and total suspended-sediment yields and concentrations across the conterminous United States (CONUS);
2. Bar plots showing the amount of total nitrogen, total phosphorus, and suspended sediment load generated within each of the 18 aggregated level 3 eco-regions that make up the CONUS, including the relative contribution from each source to the total regional load;
3. Maps showing a comparison between the SPARROW-estimated total nitrogen and total phosphorus concentrations and the EPA’s National Rivers and Streams Assessment (NRSA) benchmark nutrient concentrations within each aggregated level 3 eco-region; and
4. A data table that shows the reach-level stoichiometric ratio between the SPARROW-estimated total nitrogen and total phosphorus concentrations and a comparison between those concentrations and the applicable EPA benchmark nutrient concentration.
Citation Information
Publication Year | 2025 |
---|---|
Title | Visualizations of water quality across the conterminous United States using SPARROW 2012 simulated nutrient load estimates |
DOI | 10.5066/P14XRQ9R |
Authors | Anthony J Martinez, Elmera Azadpour, Julie A Padilla, Olivia L Miller, Matthew J Cashman |
Product Type | Software Release |
Record Source | USGS Asset Identifier Service (AIS) |
USGS Organization | Water Resources Mission Area - Headquarters |
Rights | This work is marked with CC0 1.0 Universal |
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Status of water-quality conditions in the United States, 2010–20
Degradation of water quality can make water harmful or unusable for humans and ecosystems. Although many studies have assessed the effect of individual constituents or narrow suites of constituents on freshwater systems, no consistent, comprehensive assessment exists over the wide range of water-quality effects on water availability. Using published studies, data, and models completed at...
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Status of water-quality conditions in the United States, 2010–20
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