Acoustic Doppler current profiler (ADCP) data were collected at multiple transects, and along a prescribed navigated path throughout Calumet Harbor and within the Calumet River mouth on May 12, 2015 to determine the spatial distribution of layer-averaged velocities. Additionally, flow discharge was computed for several transects in the Calumet River mouth. Velocity data were processed using the Velocity Mapping Toolbox (Parsons and other, 2013). Any data assigned a value of "-9999" are invalid or missing and should not be used for analysis. 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 [...]