This data release contains annual estimates of suspended-sediment concentration and load for the Mississippi River, St. Francisville site and the Atchafalaya River, Melville site from 1980-2015. Annual estimates and flow-normalized estimates were generated using the Weighted Regressions on Time, Season and Discharge (WRTDS) model. Input data for the model included suspended-sediment concentrations publicly available from the U.S. Geological Survey (USGS)'s National Water Information System (U.S. Geological Survey, 2016) and daily-mean streamflow estimates from the Army Corps of Engineers (2016) and USGS. These annual concentrations and loads are used to support trend analyses and provide estimates of sediment availability to the Gulf of Mexico. See companion publication for more details (Mize, S.V., Murphy, J.C., Diehl, T.H., and Demcheck, D.K., 2018, Suspended-sediment concentrations and loads in the lower Mississippi and Atchafalaya Rivers decreased by half between 1980 and 2015, Journal of Hydrology, In review). References" U.S. Army Corp of Engineers, 2016, Water levels of Rivers and Lakes data available on the World Wide Web at RiverGages.com, accessed June 10, 2016, at URL http://rivergages.mvr.usace.army.mil U.S. Geological Survey, 2016, National Water Information System—Web interface, accessed November 8, 2017, at http://dx.doi.org/10.5066/F7P55KJN.

This data release contains annual estimates of total, fine (<0.0625 millimeter [mm]), and coarse (≥0.0625 mm) suspended sediment concentration and load for 11 sites located on the Lower Mississippi River and Atchafalaya River through 2021. Annual and flow-normalized estimates were calculated using WRTDSplus, an extension of the Weighted Regressions on Time, Discharge, and Season (WRTDS) model which allows users to add a fourth explanatory variable to the model formulation (DeCicco and others, 2024). Input streamflow and suspended sediment data for these models were retrieved from Murphy and others (2022). Details about data processing and model specifications can be found in the companion publication to this data release (Murphy and others, 2025).

This data release contains annual estimates of total, fine (<0.0625 millimeter [mm]), and coarse (≥0.0625 mm) suspended sediment concentration and load for 11 sites located on the Lower Mississippi River and Atchafalaya River through 2021. Annual and flow-normalized estimates were calculated using WRTDSplus, an extension of the Weighted Regressions on Time, Discharge, and Season (WRTDS) model which allows users to add a fourth explanatory variable to the model formulation (DeCicco and others, 2024). Input streamflow and suspended sediment data for these models were retrieved from Murphy and others (2022). Details about data processing and model specifications can be found in the companion publication to this data release (Murphy and others, 2025).

This model archive summary (MAS) and associated model calibration data describes a surrogate model used to compute suspended sediment concentrations at USGS streamgage 11516530 for water years 2019-2023. The methods used follow USGS guidance as referenced in Office of Surface Water (OSW)/Office of Water Quality (OWQ) technical memoranda 2016.07 (https://water.usgs.gov/osw/pubs/memo.summaries.html) and USGS techniques and methods, book 3-chapter C4 (doi.org/10.3133/tm3C4).

This model archival summary summarizes the suspended-sediment concentration (SSC; U.S. Geological Survey [USGS] parameter code 80154) model developed to compute 15-minute, hourly, or daily SSC from July 26, 2018, onward. This model is specific to USGS site 06887000, the Big Blue River near Manhattan, Kansas, during this study period and cannot be applied to data collected from other locations on the Big Blue River or data collected from other water bodies. The methods follow USGS guidance as referenced in relevant Office of Surface Water/Office of Water Quality Technical Memoranda and USGS Techniques and Methods, book 3, chapter C4 (Rasmussen and others, 2009; U.S. Geological Survey, 2016).

This model archival summary summarizes the suspended-sediment concentration (SSC; U.S. Geological Survey [USGS] parameter code 80154) model developed to compute 15-minute, hourly, or daily SSC from July 26, 2018, onward. This model is specific to USGS site 06887000, the Big Blue River near Manhattan, Kansas, during this study period and cannot be applied to data collected from other locations on the Big Blue River or data collected from other water bodies. The methods follow USGS guidance as referenced in relevant Office of Surface Water/Office of Water Quality Technical Memoranda and USGS Techniques and Methods, book 3, chapter C4 (Rasmussen and others, 2009; U.S. Geological Survey, 2016).

This model archive summary (MAS) and associated model calibration data describes a surrogate model used to compute point location suspended sediment concentrations at USGS streamgage 11510700 for water years 2019-2023. The methods used follow USGS guidance as referenced in Office of Surface Water (OSW)/Office of Water Quality (OWQ) technical memoranda 2016.07 and USGS techniques and methods, book 3-chapter C4 (Rasmussen and others, 2009).

This model archive summary (MAS) and associated model calibration data describes a surrogate model used to compute point location suspended sediment concentrations at USGS streamgage 11510700 for water years 2019-2023. The methods used follow USGS guidance as referenced in Office of Surface Water (OSW)/Office of Water Quality (OWQ) technical memoranda 2016.07 and USGS techniques and methods, book 3-chapter C4 (Rasmussen and others, 2009).

These model archive summaries document surrogate regression models developed to estimate suspended-sediment concentration (SSC) at three USGS streamgages in New York: Mohawk River above State Highway 30A at Fonda, USGS site number 01349527; Schoharie Creek at Burtonsville, USGS site number 01351500; and Mohawk River at Cohoes, USGS site number 01357500. Ordinary least squares regression equations were developed between suspended-sediment concentration and turbidity using the U.S. Geological Survey Surrogate Analysis and Index Developer (SAID) Tool (Domanski and others, 2015) and methods described in Rasmussen and others (2009). Model summaries were developed following guidance in USGS Office of Surface Water Technical Memorandum (TM) 2016.07, Office of Water Quality TM 2016.10.

These model archive summaries document surrogate regression models developed to estimate suspended-sediment concentration (SSC) at three USGS streamgages in New York: Mohawk River above State Highway 30A at Fonda, USGS site number 01349527; Schoharie Creek at Burtonsville, USGS site number 01351500; and Mohawk River at Cohoes, USGS site number 01357500. Ordinary least squares regression equations were developed between suspended-sediment concentration and turbidity using the U.S. Geological Survey Surrogate Analysis and Index Developer (SAID) Tool (Domanski and others, 2015) and methods described in Rasmussen and others (2009). Model summaries were developed following guidance in USGS Office of Surface Water Technical Memorandum (TM) 2016.07, Office of Water Quality TM 2016.10.