Water temperature (degrees Celsius) and specific conductance (microsiemens per centimeter at 25 degrees Celsius; TC) were measured at U.S. Geological Survey streamgage 05536995, located at Chicago Sanitary and Ship Canal near the Electrical Dispersal Barrier System in Romeoville, Illinois. The TC data were measured every five minutes at four gage height levels above the gage datum (P1 = 21 feet, P2 = 17 feet, P3 = 13 feet, P4 = 9 feet). The gage datum is 551.76 feet above the North American Vertical Datum of 1988 (NAVD 88). Daily mean and five-minutes water temperature and specific conductance data were downloaded from the National Water Information System (NWIS) database and stored in Comma Separated Values (CSV) files. Daily mean data are stored in a CSV file, "05536995-WY2018-temp-speccond-dailymean.csv" and the data measured every five minutes in "05536995-WY2018-temp-speccond-five-minute.csv." The 7-day moving average of daily mean values was calculated in a custom Python script. For each day, the 7-day moving average was calculated as the average of daily mean value for that day and the six previous days. This spreadsheet was saved as a CSV file, "05536995-WY2018-temp-speccond-7daymovavg.csv." The water year 2018 annual minimum, maximum, mean, median, and standard deviation were calculated for each of the four temperature probes and the four specific conductance probes in a custom Python script and saved as a CSV file, "05536995-WY2018-temp-speccond-annualstats.csv". The CSV files containing five-minute, daily mean, 7-day moving average, and annual statistics (minimum, maximum, mean, median, and standard deviation) for water year 2018 can be downloaded from this page.