The U.S. Geological Survey (USGS) monitors water surface flow reversals, commercial vessel traffic, and temperature and specific conductance in the U.S. Army Corps of Engineers Electric Dispersal Barrier System (EDBS) on the Chicago Sanitary and Ship Canal, Chicago, Illinois. These data are planned to be released on USGS ScienceBase annually. This data release is the summary of all the data collected during water year 2020 (October 1, 2019, to September 30, 2020). Bera and others (2020) describe all the data collected during October 1, 2018, to September 30, 2019. Water surface flow reversals at the EDBS are monitored using surface velocity radar. Commercial vessel traffic patterns through the EDBS are documented using a motion-activated video camera. Commercial vessel traffic data is only available for October 17, 2019, to September 30, 2020. Temperature and specific conductance are reported in near real-time from USGS sensors installed just downstream from the EDBS. References Cited: Bera, M., LeRoy, J.Z., Johnson, K.K., and Doyle, H.F., 2020, Monitoring data to support the operation of the Electric Dispersal Barrier System on the Chicago Sanitary and Ship Canal at Romeoville, Illinois, October 1, 2018, to September 30, 2019: U.S. Geological Survey data release, https://doi.org/10.5066/P9VP5HHH.