Lake McConaughy, Nebraska
From the ilovelakemac.com website: "Lake McConaughy is Nebraska’s biggest lake and the largest reservoir in a four state region. At full storage, Lake Mac is twenty miles long, four miles wide, and 142 feet deep at the dam." The lake's storage capacity is listed as about 1.7 million acre feet. In California terms, that's just a little bigger than Lake Berryessa; it would be the sixth-biggest reservoir in California (after Shasta, Oroville, New Melones, Trinity, and San Luis--I think). The dam pictured here is Kingsley Dam, one of the structures approved during the big federal push to build water projects during the Depression. It was approved in 1936 and completed in 1941.