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2.64 million stream segments and 378,088 lakes have watershed and local catchment nitrogen and phosphorus budgets derived from a 30-year annual time-series (1987-2017). The dataset integrates the U.S. EPA's Next Generation National Nutrient Inventory with the StreamCat database using a tabular dasymetric apportionment process. It was developed by the U.S. Environmental Protection Agency.
License is specified as 'other-license-specified'; users must check the specific terms before use. Data is distributed in a ZIP file format.