Water velocities were measured in the Calumet Harbor for 5 dates in 2015 and 2016 using Teledyne Rio Grande 600 kHz acoustic Doppler current profilers (ADCP). The data were georeferenced with differential GPS receivers with submeter accuracy. These velocity data were collected in cooperation with the US Army Corps of Engineers-Chicago District. ADCP data were collected on the following dates and for the following purposes: May 12, 2015: Water velocities in the Calumet Harbor and Calumet River. Unsteady discharges in the Calumet River mouth. September 9, 2015: Water velocities in the Calumet Harbor and Calumet River mouth. October 5, 2015: Water velocities in the Calumet Harbor and Calumet River mouth. March 25, 2016: Water velocities in the Calumet Harbor and Calumet River mouth. May 6, 2016: Water velocities in the Calumet Harbor and Calumet River mouth. Datasets were processed using the Velocity Mapping Toolbox (Parsons and other, 2013) to derived temporally- and spatially-average water velocity values for each survey data. Refer to each dataset for specific details. Parsons, D. R., Jackson, P. R., Czuba, J. A., Engel, F. L., Rhoads, B. L., Oberg, K. A., Best, J. L., Mueller, D. S., Johnson, K. K. and Riley, J. D. (2013), Velocity Mapping Toolbox (VMT): a processing and visualization suite for moving-vessel ADCP measurements. Earth Surf. Process. Landforms, 38: 1244–1260. doi: 10.1002/esp.3367