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
Kolkewadi Dam MSEB. The area behind the dam is one of the most sparsely populated areas in the state. The spillway of the dam is located at the center. It has 3 radial gates. Kolkewadi Dam Kolkewadi Dam or Kolkiwadi Dam is a dam located in the Konkani region, Ratnagiri district of Maharashtra, India. It is located in Kolkiwadi, about near the village of Alore, near Chiplun. The dam is part of the Koyna Hydroelectric Project. It contributes in the 3rd stage of power generation of the Koyna Hydroelectric Project. The electricity is generated in the underground power station located at the