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Data release of Bathymetric Map, Surface Area, and Capacity of Grand Lake O' the Cherokees, Northeastern Oklahoma, 2019

December 21, 2020

The U.S. Geological Survey in cooperation with the Grand River Dam Authority completed a high-resolution multibeam bathymetric survey to compute a new capacity and surface-area table. The capacity and surface-area tables describe the relation between the elevation of the water surface and the volume of water that can be impounded at each given water-surface elevation. The capacity and surface area of Grand Lake O' the Cherokees were computed from a Triangular Irregular Network (TIN) surface created in Global Mapper Version 21.0.1. The TIN surface was created from three datasets: (1) a multibeam bathymetric survey of Grand Lake O' the Cherokees in 2019 (Hunter and others 2020), (2) a 2017 USGS bathymetric survey of the Neosho, Spring, and Elk Rivers (Hunter and others, 2017; Smith and others, 2017), and (3) a 2010 lidar-derived digital elevation model (DEM) (USGS, 2016). Where the USGS 2019 and USGS 2017 survey data overlapped, the more recently collected 2019 USGS data were given preference. The DEM data were used in areas with land-surface elevations of more than 744 ft. above NAVD 88 where the multibeam data could not be collected. With the 2019 multibeam data being the predominant source of data this data set reflects lake conditions from 2019 when the multibeam data were collected.