This data release supports the following publication: Hittle, Elizabeth, 2017, Longshore Water-Current Velocity and the Potential for Transport of Contaminants: A Pilot Study in Lake Erie from Walnut Creek to Presque Isle State Park Beaches, Erie, Pennsylvania, June and August 2015: U.S. Geological Survey Open-File Report 2016–1206 126 p., https://doi.org/10.3133/ofr20161206. This data set contains water quality data (temperature, specific conductance, and turbidity) measured and recorded on June 24, 2015 with a YSI EXO probe and depth measured and recorded by a design analysis 700H pressure transducer. The data was collected along select transects at ~300 meter spacing by moving the probe down and up throughout the water column. Data is provided only when the probe was moving from the bottom to the top of the water column as the data recorded from top to bottom was found to be biased. Data was recorded at 5 second intervals except for transects 17 and 24 which were collected at 1 second intervals. The depth data for transects 4 and 6 are not available due to user error.