OTWSC Webinar, Friday May 17th -Grand Lake (Oklahoma) Multibeam Bathymetric Survey Release Date: USGS Oklahoma-Texas Water Science Center Webinar Series - Friday May 7, 11 am Central In cooperation with the Grand River Dam Authority, in the summer of 2019 USGS surveyed the Grand Lake O’ the Cherokees, which is locally called Grand Lake and located in northeastern Oklahoma. The survey was conducted to prepare an updated bathymetric map and surface-area and capacity table. Due to the natural changes to the reservoir, new capacity and area tables are needed periodically. Capacit...