The Grand Calumet River is located east of Chicago, Illinois and flows east to west across the Indiana-Illinois border to its confluence with the Little Calumet River. In 2017, a suite of water level, temperature, and bathymetric data were collected along the Grand Calumet River. Water level and water temperature were continuously monitored at five locations in the Grand Calumet River between late February and early November 2017, using Van Essen Mini-Diver DI 501 dataloggers (herein referred to as "Mini-Divers"). The Mini-Divers are submersible instruments with sensors for measuring and recording water pressure and temperature. Atmospheric pressure in the area was continuously monitored during this time period using a Van Essen Baro-Diver pressure transducer. The water pressure data from the Mini-Divers were compensated for variations in atmospheric pressure and converted to water levels.