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Bathymetric data for the Maumee River between Defiance and Toledo, Ohio, 2019

February 4, 2022

As part of the Great Lakes Restoration Initiative (GLRI) project template 774-18 entitled "Development of monitoring and response methodologies, and implementation of an Adaptive Management Framework to work towards Eradication of Grass Carp in Lake Erie" an integrated bathymetric/hydrodynamic/water-quality survey of the Maumee River (Ohio) was completed by the U.S. Geological Survey (USGS) in the summer of 2019. These data were collected to inform the development of a one-dimensional hydraulic model and associated Fluvial Egg Drift Simulator (FluEgg) model of the Maumee River downstream from Defiance, Ohio. The data contained in this data release were collected by the USGS Ohio-Kentucky-Indiana Water Science Center to inform the development of these models by the USGS Central Midwest Water Science Center. The survey was completed over two periods of time: June 24-28, 2019, and July 29 to August 1, 2019. The first survey period concentrated on the reach between Waterville, Ohio, and Lake Erie, while the second period concentrated on the reach between Defiance, Ohio, and Grand Rapids, Ohio. Survey data include bathymetry (riverbed elevation), three-dimensional water velocity, discharge, and basic water-quality parameters. However, this data release is limited to only the bathymetry data (riverbed elevations) from the survey. A total of 251 cross sections were surveyed (141 upstream from and 110 downstream from Grand Rapids Dam, respectively) and data were also collected along streamwise transits between sections. Due to rapids, high-water, access, and safety concerns, no data were collected in the 23.9 kilometer reach downstream from the dam at Grand Rapids, Ohio. The upstream-most cross section is 280 meters downstream from the low-head dam approximately 6.6 kilometers downstream from Defiance, Ohio. The downstream-most cross section is located 290 meters downstream from the U.S. Coast Guard Station at Toledo, Ohio (3900 N Summit St, Toledo, OH 43611). All data were collected by a manned survey vessel with a two-person survey crew of trained hydrographers. All data were georeferenced using a Trimble R10 Global Navigation Satellite System (GNSS) receiver mounted on the survey vessel and connected to the Ohio Department of Transportation (ODOT) real-time virtual reference station (VRS) network. Depths were measured using the 600 kHz vertical beam from a 1200 kHz Teledyne RD Instruments RiverPro acoustic Doppler current profiler (ADCP) deployed on a fixed mount from the survey vessel. The GNSS receiver was mounted directly above the ADCP and the offset between the GNSS antenna and the face of the vertical beam transducer was measured in the field and accounted for in post-processing. The sampling frequency varied slightly with the dynamic configuration of the ADCP but was generally between 1 to 2 Hertz.