This data release contains the models and their inputs and outputs needed to reproduce the findings for the publication by Soong and Over (2022), "Effect of Uncertainty of Discharge Data on Uncertainty of Discharge Simulation for the Lake Michigan Diversion, Northeastern Illinois and Northwestern Indiana." These data were developed in cooperation with the U.S. Army Corps of Engineers, Chicago District, for the Lake Michigan Diversion Accounting program. Data are provided in four zip files and one MS Word file. The MS Word file 4.ReadMe.HSPF_Recalibrations_with_17TimeSeriesPairs.docx documents the recalibration of the Hydrological Simulation Program - FORTRAN (HSPF) model with discharge time series pairs that characterize the uncertainty of the published daily discharge at the two U.S. Geological Survey (USGS) streamgages, analyzed in 2.PubQUncertaintyEst.zip. It also points to data included in four zip files. The zip files provide the inputs, scripts and other executables, and sample outputs from the model archive for the publication. In addition, the zip files document the executables (1.Executables.zip) and the following modeling tasks: 2.PubQUncertaintyEst.zip - Estimation of the uncertainty of published daily discharge at two USGS streamgages; 3.BaseModel-ParameterUncertainty.zip - Estimation of the parameters of the base HSPF model; and 5.HSPFsimulations.zip - Simulations of discharge with HSPF for the nine study watersheds.