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A Century of Water Quality Sampling in Rivers of the United States


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Created: Jul 09, 2026 at 7:50 p.m. (UTC)
Last updated: Jul 10, 2026 at 2:12 p.m. (UTC)
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Content types: Geographic Feature Content 
Sharing Status: Public
Publication Status:
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Abstract

This repository contains the code and data needed to reproduce the findings in the homonimous research paper "A Century of Water Quality Sampling in Rivers of the United States" to be published in Communications Earth and Environment (https://www.nature.com/commsenv/)

The repository has a simple structure with two folders: 1Code and 2Data. The first folder contains five .R files that follow the exact same order of the sections and figures in the paper. The code in each of these files is commented with great detail, so that all main and supplementary figures are explicitly mentioned in the code, as well as the files and data sources needed to run the code. The second folder contains all files needed to reproduce the figures, except for the two largest datasets which can be downloaded directly from their source, as also mentioned in the code.

These two additional sources are 1) The National Hydrography Dataset High Resolution (NHD-HR), downloadable through https://www.usgs.gov/national-hydrography/access-national-hydrography-products, and 2) The ChemLotUS dataset, downloadable through a HydroShare repository (https://doi.org/10.4211/hs.9b2b865acc51481babc74599470a3bfc) and comprehensively described in the corresponding paper published in Water Resources Research (https://doi.org/10.1029/2024WR039355)

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Conterminous United States
North Latitude
49.3800°
East Longitude
-66.9500°
South Latitude
24.5200°
West Longitude
-124.7700°

Temporal

Start Date:
End Date:

Content

Data Services

The following web services are available for data contained in this resource. Geospatial Feature and Raster data are made available via Open Geospatial Consortium Web Services. The provided links can be copied and pasted into GIS software to access these data. Multidimensional NetCDF data are made available via a THREDDS Data Server using remote data access protocols such as OPeNDAP. Other data services may be made available in the future to support additional data types.

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Related Resources

This resource requires Fernandez, N., Cohen, M. J., Jawitz, J. W. (2025). ChemLotUS: A Benchmark Dataset of Lotic Chemistry across US River Networks, HydroShare, https://doi.org/10.4211/hs.9b2b865acc51481babc74599470a3bfc
This resource requires National Hydrography Dataset High Resolution (NHD-HR), accessible through https://www.usgs.gov/national-hydrography/nhdplus-high-resolution and/or https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Hydrography/NHDPlusHR/

How to Cite

Fernandez, N., Zuccolotto, G., Lucchese, L., Slevin, V., Godavarthy, G., Gardner, J., Cohen, M. J., Jawitz, J. W. (2026). A Century of Water Quality Sampling in Rivers of the United States, HydroShare, http://www.hydroshare.org/resource/7ce85b47dbf74588a36f46b1b226c5a2

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/
CC-BY

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