Singlebeam echosounder data were collected in the nearshore of the Chicago Park District in Chicago, IL. The parks that are monitored include Foster Beach, Montrose Beach, 63rd Street Beach, and Rainbow Beach. These data were collected under contract for the Illinois Department of Natural Resources Coastal Management Program. The areas targeted for bathymetric measurements are paired with areas targeted for UAS (unoccupied aerial system) onshore photographic measurements. Data is collected at 25-m wide transects. The bathymetric data were collected as part of a multi-year monitoring program to detect and measure lake-bottom change as it related to erosion of the lake bottom and longshore and offshore sand movement or transport.