Water-quality constituents were measured along planned survey lines, which were generally perpendicular to the shoreline and spaced 100 meters apart, over an approximately 2.3-mile section of nearshore Lake Erie on June 10-12, 2019 (survey 1), and August 19-21, 2019 (survey 2), using a YSI 6920 V2 multiparameter sonde towed from the side of a marine survey vessel at about 1-ft depth. Water-quality data collected in this area included near-surface measurements of water temperature, specific conductance, pH, dissolved oxygen, and turbidity. The water-quality data were measured at 5-second intervals and were geo-referenced with a global navigation satellite system (GNSS) smart antenna with submeter accuracy. There was a total of 43 survey lines which typically started about 50 meters offshore and ended 500 meters offshore, and the survey lines covered the area around the mouth of Euclid Creek, Villa Angela Beach, Wildwood Marina, and the Easterly Wastewater Treatment Plant. Additional data were also measured along a series of lines parallel to the shoreline throughout the survey area. Data were post-processed with a custom MATLAB script to geo-reference the water-quality data based on time stamps and to manually edit the data to remove spikes and other errors. Each water-quality measurement has an associated latitude and longitude (WGS84) and sample depth (in feet) below the surface. All water-quality sensors were calibrated per USGS standard methods prior to the start of the survey. These water-quality measurements were collected over the course of six total days, three in early summer (survey 1) and three in late summer (survey 2), to characterize circulation, mixing, and transport patterns in nearshore Lake Erie in the vicinity of Euclid Creek and Villa Angela Beach.