Lake Oahe Lake Oahe Lake Oahe (oh-WAH'-hee) is a large reservoir behind Oahe Dam on the Missouri River; it begins in central South Dakota and continues north into North Dakota in the United States. The lake has an area of and a maximum depth of . By volume, it is the fourth-largest reservoir in the US. Lake Oahe has a length of approximately and has a shoreline of . 51 recreation areas are located along Lake Oahe, and 1.5 million people visit the reservoir every year. The lake is named for the 1874 Oahe Indian Mission. Lake Oahe begins just north of
Beyyurdu Dam Beyyurdu Dam The Beyyurdu Dam is a gravity dam under construction on the Bembo River (an eventual tributary of the Great Zab) in Beyyurdu, Şemdinli district of Hakkâri Province, southeast Turkey. Under contract from Turkey's State Hydraulic Works, Özdoğan Group began construction on the dam in 2008 and a completion date has not been announced. In July 2012 and May 2014 suspected Kurdistan Workers' Party (PKK) militants set fire to equipment at the construction sites of the Beyyurdu Dam and also the Aslandağ Dam which is located upstream. The reported purpose of the dam is water storage and it can