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• Organization: U.S. Environmental Protection Agency
• Dataset Last Updated: January 01, 2014

QUAL2K (or Q2K) is a river and stream water quality model that is intended to represent a modernized version of the QUAL2E (or Q2E) model (Brown and Barnwell 1987).

• Organization: Department of the Interior
• Dataset Last Updated: August 31, 2023 at 12:00 AM

This data release contains information to support water quality modeling in the Delaware River Basin (DRB). These data support both process-based and machine learning approaches to water quality...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: August 27, 2020 at 12:00 AM

To better understand the influence of human activities and natural processes on surface-water quality, the U.S. Geological Survey (USGS) developed the SPARROW (SPAtially Referenced Regressions On...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: August 27, 2020 at 12:00 AM

To better understand the influence of human activities and natural processes on surface-water quality, the U.S. Geological Survey (USGS) developed the SPARROW (SPAtially Referenced Regressions On...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: April 15, 2021 at 12:00 AM

This data release contains mean-annual total nitrogen (TN) loads predicted by a SPARROW model for individual stream and shoreline reaches in the Chesapeake watershed as defined by NHDPlus, a...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: August 20, 2020 at 12:00 AM

This dataset contains modeled hourly streamflow in cubic meters per second at each of about eighteen thousand selected operational and water-quality stream gage locations. It was assembled from...

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• XML

• Organization: U.S. Environmental Protection Agency
• Dataset Last Updated: April 11, 2017

We demonstrate a novel, spatially explicit assessment of the current condition of aquatic ecosystem services, with limited sensitivity analysis for the atmospheric contaminant mercury. The...

• FILE
• XLSX

• Organization: Department of the Interior
• Dataset Last Updated: August 27, 2020 at 12:00 AM

This dataset provides details from stream metabolism models for 20 stream sites in the United States that were sampled as part of the National Water Quality Program's Regional Stream Quality...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: January 25, 2022 at 12:00 AM

This data release contains bootstrap values of mean-annual total dissolved solids (TDS) loads predicted by a SPARROW model for individual stream reaches in the Upper Colorado River Basin watershed...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: November 14, 2023 at 12:00 AM

This data release contains model code and input data for, and predictions from, both a dynamic stream dissolved solids and a static baseflow dissolved solids SPARROW (SPAtially Referenced...

• XML

• Organization: Department of the Interior
• Dataset Last Updated: October 15, 2024 at 12:00 AM

This data release collates stream water temperature observations from across the United States from four data sources: The U.S. Geological Survey's National Water Information System (NWIS), ...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: May 10, 2022 at 12:00 AM

This dataset contains modeled hourly streamflow in cubic meters per second at each of about eighteen thousand selected operational and water-quality stream gage locations. It was assembled from...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: August 31, 2023 at 12:00 AM

This data release contains information to support water quality modeling in the Delaware River Basin (DRB). These data support both process-based and machine learning approaches to water quality...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: August 20, 2020 at 12:00 AM

This dataset contains modeled hourly streamflow at each about eighteen thousand selected operational and water quality stream gage locations. It was assembled from publicly available retrospective...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: August 27, 2020 at 12:00 AM

This data collection consists of a synthetic stream network and associated catchments developed as the foundation for a Spatially Referenced Regressions on Watershed Attributes (SPARROW)...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: March 21, 2025 at 12:00 AM

Regression models were developed for computing the suspended-sediment concentration (SSC) at the U.S. Geological Survey (USGS) streamflow gaging station Waihi Stream at Honolulu, Hawaii (16238500)...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: April 04, 2023 at 12:00 AM

This data release contains 15 datasets and associated metadata of watershed characteristics and data related to stream water quality and constituent load estimation for 15 study watersheds in...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: May 27, 2026 at 12:00 AM

Regression models were developed for computing the suspended-sediment concentration (SSC) at the USGS streamflow gaging station 16249000 Waimanalo Stream at Waimanalo, Oahu, Hawaii. Regression...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: December 09, 2025 at 12:00 AM

Daily estimates of baseflow derived from a non-linear, baseflow separation model. The files "baseflow_huc_01_02_03.csv", "baseflow_huc_04_05.csv", "baseflow_huc_06_07_08_09_10.csv",...

• XML
• XML

• Organization: Department of the Interior
• Dataset Last Updated: June 05, 2025 at 12:00 AM

This data release presents chemical results from investigations of surface-water quality in the Potomac River watershed (encompassing Washington, D.C. and parts of West Virginia, Virginia,...

• XML
• XML