Data and scripts used in water-quality trend analysis in the International Souris River Basin, Saskatchewan and Manitoba, Canada and North Dakota, United States 1970-2020

A comprehensive study to evaluate water-quality trends in the International Souris River Basin, Saskatchewan and Manitoba, Canada and North Dakota, United States was completed by the U.S. Geological Survey (USGS) in cooperation with the International Joint Commission. In this dataset all files necessary to run trend models and produce results published in U.S. Geological Scientific Investigations Report 2023-5084 [Nustad, R.A., and Tatge, W.S., 2023, Comprehensive water-quality trend analysis for selected sites and constituents in the International Souris River Basin, Saskatchewan and Manitoba, Canada, and North Dakota, United States, 1970–2020: U.S. Geological Survey Scientific Investigations Report 2023–5084, 83 p., https://doi.org/ 10.3133/ sir20235084]. In addition, this dataset contains data for reservoir and Canadian streamflow, and water-quality by group (MI = major ion and dissolved solids, NUT = nutrients, PHY = physical parameters) contained in comma separated values (csv) files (site_flow and country/province_data) for selected sites used in trend and spatial analysis of the Souris River Basin. Streamflow data for the selected United States sites were gathered from the National Water Information System (https://nwis.waterdata.usgs.gov/nwis). Water-quality data for the selected sites in the United States were gathered from the National Water Quality Monitoring Council Water Quality Portal (https://www.waterqualitydata.us/) and collected by two additional agencies NDDEQ and the USGS.