Bathymetry of the Green River near Brownsville, Kentucky, July 2023

These data are bathymetry (river bottom elevation) in XYZ format (Easting, Northing, Elevation), generated from the July 24–25, 2023, and July 31, 2023, bathymetric survey of the Green River near Brownsville, Kentucky, from approximately 1.5 miles downstream from the Brownsville boat ramp to approximately 0.8 mile upstream from the former Green River Lock and Dam #6 site (3.8 miles total reach length). Hydrographic data were collected using an acoustic Doppler current profiler (ADCP) with an integrated global navigation satellite system (GNSS) smart antenna. The ADCP and GNSS antenna were mounted on a marine survey vessel, and data were collected as the survey vessel traversed the river along planned survey lines. A total of 207 survey lines were oriented approximately perpendicular to the primary flow direction at variable spacing (generally spaced 100 feet apart but at a 500-foot spacing along the downstream portion of the reach and at 10- to 50-foot spacing in two areas of interest). Data collection software integrated and stored the depth and position data from the ADCP and GNSS antenna in real time. Water-surface elevations were measured approximately every 500 feet throughout the survey area with a survey-grade integrated GNSS system with real-time kinematic (RTK) observations to convert measured bathymetric depths to elevations referenced to the North American Vertical Datum of 1988 (NAVD 88). RTK observations were made using the Kentucky Continually Operating Reference System (KYCORS) network operated by the Kentucky Transportation Cabinet. Data processing required computer software to extract the bathymetric data from the raw data files and to compile and map the information. The final comma-delimited file contains columns of Easting and Northing in feet North American Datum of 1983 (NAD83) Kentucky State Plane Single Zone (FIPS code 1600), and Elevation in feet NAVD 88.