Bathymetric survey data of the Black River from Clearwater Lake Dam near Piedmont, Missouri, to southern Butler County, Missouri

The U.S. Geological Survey (USGS) in cooperation with the Little Rock District, U.S. Army Corps of Engineers conducted a bathymetric survey of the Black River from Clearwater Lake Dam near Piedmont, Missouri, to southern Butler County, Missouri, from June 16-19, 2020 and from June 22-24, 2020. One hundred and eight sites were surveyed at pre-established transect locations along a 45-mile reach at distances spaced from about 0.3 to 2 miles apart. River-channel cross sections were surveyed to determine water depths along each transect using an acoustic Doppler current profiler (ADCP). Positional location of the water-depth locations was obtained from a global positioning system receiver onboard the ADCP. Water-surface elevation at the water-depth locations was computed using vertical control points collected at the location of the cross sections with survey-grade Global Navigation Satellite Systems (GNSS) equipment. Standard methods of practice (Rydlund and Densmore, 2012) were used while obtaining the GNSS control points. Channel cross-section point elevations were obtained by subtracting the water depths along the cross-section transect from the water-surface elevation at the location of the transect. Positional location is reported in World Geodetic System 1984 geographic decimal degree coordinates. Depth is reported in meters and bathymetric elevation is referenced to the North American Vertical Datum of 1988. These data are provided in the Environmental Systems Research Institute (ESRI) shapefile format consisting of a group of files that have been compressed into a zip archive that is named black_river_survery_shapefile.zip. References Rydlund, P.H., Jr., and Densmore, B.K., 2012, Methods of practice and guidelines for using survey-grade global navigation satellite systems (GNSS) to establish vertical datum in the United States Geological Survey: U.S. Geological Survey Techniques and Methods, book 11, chap. D1, 102 p. with appendixes.