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
Aroona Dam Aroona Dam Aroona Dam is a reservoir in the Australian state of South Australia located in the gazetted locality of Leigh Creek about west of the locality’s town centre. The dam consists of a concrete gravity dam of a height of and a width of which holds back a lake of a volume of and which extends for a distance about to the east of the dam wall. The origin of its name is not mentioned in sources. However, the word ‘Aroona’ is listed in the official government place name gazetteer as the name of some geographic features either adjoining