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
Rogun Dam the dam was suspended in August 2012 pending the World Bank assessment. In 2010, Tajikistan launched an IPO to raise US$1.4billion to finish construction of the dam. By April 26 of that year the Tajik government had raised just US$184 million, enough for two years of construction. On July 1, 2016 the state commission in charge of the project had chosen the Italian company Salini Impregilo to carry out the construction for $3.9 billion. The project is broken down into four components, with the most expensive one involving the building of a 335-meter-high rockfill dam which will entail costs of