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2.64 million stream segments and 378,088 lakes have watershed and local catchment nutrient budgets for nitrogen and phosphorus. The U.S. Environmental Protection Agency created this dataset by integrating its National Nutrient Inventory with the StreamCat database. It provides a 30-year annual time-series from 1987 to 2017.
Data is distributed in ZIP format. License is listed as 'other-license-specified', requiring review of specific terms before use.