This dataset contains measurements of water quality parameters (temperature, salinity, specific conductance, dissolved oxygen, and pH) and concentrations of dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and particulate organic carbon (POC) in canals of Jean Lafitte National Historical Park and Preserve (hereafter, the Park) during wet and dry seasons in 2022 and 2023. Four field campaigns were conducted on April 26, 2022, October 27, 2022, March 1, 2023, and August 3, 2023, covering pre-, during, and post-canal backfilling construction in the Park. Data can also be found at USGS National Water Information System (NWIS, https://waterdata.usgs.gov/nwis/sw).