The 7 Largest Man-Made Lakes in the United States - Page 4 of 9

Lake Oahe, South Dakota

Lake Oahe ranks as the fourth largest man-made lake in the United States, with a total capacity of 23,500,000 acre-feet. It covers a total surface area of 374,000 acres and extends for 231 miles across South Dakota. The reservoir was built to serve as flood control and provide hydroelectric power, irrigation, recreation, navigation benefits, and habitat for diverse wildlife. It was created by the Oahe Dam, which is 245 feet tall and 9,360 feet long and is the fifth largest dam on the planet based on water volume. Lake Oahe may be man-made, but it hosts a rich ecosystem that includes many freshwater fish like walleye, pike, catfish, bass, and salmon. Nearly 1.5 million people visit the reservoir annually.