Revision 2.0 by Sydney Foks on December 22, 2022 and revision 3.0 by Leah Staub on March 30 2023. To review the changes that were made, see “version_history_nhm.txt” in the attached files section. Source data include daily mean streamflow observations from the National Water Information System (NWIS) database and daily mean runoff predictions from the National Hydrologic Model Infrastructure application of the Precipitation-Runoff Modeling System (NHM-PRMS) version 1.0 "byHRU_musk_obs" calibration (Muskingum routing). Daily streamflow errors were calculated by comparing predicted and observed mean daily flow.