This data release (DR) is the update of the U.S. Geological Survey (USGS) - ScienceBase (SB) DR Bera (2024b), with the processed data for the period October 1, 2022, through September 30, 2023. This SB DR describes the watershed data management (WDM) database WBDR23.WDM. The precipitation data are collected from a tipping-bucket rain-gage network and the hydrologic data (stage and discharge) are collected at USGS streamflow-gaging stations in and around West Branch DuPage River watershed in DuPage County, Illinois (Bera, 2017). Hourly precipitation and hydrologic data for the period October 1, 2022, through September 30, 2023, are processed following the guidelines described in Bera (2017) and appended to WBDR22.WDM (Bera, 2024b) and renamed as WBDR23.WDM. Meteorological data (wind speed, solar radiation, air temperature, dewpoint temperature, and potential evapotranspiration) from October 1, 2022, through September 30, 2023, are copied from ARGN23.WDM (Bera, 2024a) and uploaded to WBDR23.WDM. The missing rainfall periods are filled with the nearby raingage data as a part of the QA/QC process. Some missing period is filled with the data from a nearby raingage in Salt Creek watershed (Bera, 2014). The complete list of missing precipitation data period and the nearby stations used to fill in those missing periods during October 1, 2022, through September 30, 2023, is given in the Table1. Table1 is provided in comma separated values (CSV) file format. The list of snow affected days of precipitation data and the missing and estimated period of the stage and flow data in WBDR22.WDM database during the period October 1, 2022, through September 30, 2023, are given in the USGS annual Water Data Report at https://wdr.water.usgs.gov. Data in dataset number (DSN) 107 and 801–811 are used in comparisons of precipitation data. DSN 107 contains hourly precipitation data from tipping bucket rain gages collected at Argonne National Laboratory at Argonne, Illinois. DSN 801-811 contains the processed Next Generation Weather Radar (NEXRAD)-Multisensor Precipitation Estimates (MPE) data from 11 NEXRAD–MPE subbasins in the West Branch DuPage River watershed as described in Bera and Ortel (2018). The data are downloaded and uploaded daily into a WDM database that is used for the real-time streamflow simulation system. Data from DSN 107 and 801-811 are copied from this WDM and stored in WBDR23.WDM. DSN 107 and 801-811 are updated with the data through September 30, 2023. Data in DSN 4031 (water-surface elevation at West Branch DuPage River at Fawell Dam) is updated through September 30, 2023, similarly (Bera, 2017). Data in DSN 4031 is maintained by the DuPage County Stormwater Department and not Quality Assured/Quality Controlled. Bera (2017) describes DSN 6107 to 7019 and Bera (2023) describes DSN 7020 to 7023. These DSNs are used for storing the HSPF computed streamflow, snow variables for snow depth and snow water equivalent. No data is added to any of these DSNs. To open the WDM database SC23.WDM the user may use the Sara Timeseries Utility executable file attached in this page. Table1.csv can be opened with any text editor or Microsoft Excel. References Cited: Bera, M., 2024a, Meteorological Database, Argonne National Laboratory, Illinois: U.S. Geological Survey data release, https://doi.org/10.5066/P146RBHK. Bera, M., 2024b, Watershed Data Management (WDM) Database (WBDR22.WDM) for West Branch DuPage River Streamflow Simulation, DuPage County, Illinois, January 1, 2007, through September 30, 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P1LDIASU. Bera, M., 2023, Watershed Data Management (WDM) Database (WBDR21.WDM) for West Branch DuPage River Streamflow Simulation, DuPage County, Illinois, January 1, 2007, through September 30, 2021: U.S. Geological Survey data release, https://doi.org/10.5066/P9F3D8ZI. Bera, M., and Ortel, T.W., 2018, Processing of next generation weather radar-multisensor precipitation estimates and quantitative precipitation forecast data for the DuPage County streamflow simulation system: U.S. Geological Survey Open-File Report 2017–1159, 16 p., https://doi.org/10.3133/ofr20171159. Bera, M., 2017, Watershed Data Management (WDM) database for West Branch DuPage River streamflow simulation, DuPage County, Illinois, January 1, 2007, through September 30, 2013: U.S. Geological Survey Open-File Report 2017–1099, 39 p., https://doi.org/10.3133/ofr20171099. Bera, M., 2014, Watershed Data Management (WDM) database for Salt Creek streamflow simulation, DuPage County, Illinois, water years 2005–11: U.S. Geological Survey Data Series 870, 18 p., https://doi.org/10.3133/ds870.