National Geographic : 1948 Nov
The National Geographic Magazine A Concrete Dam Impounds Waters of the Rio Negro in Uruguay's First Hydroelectric Project Situated almost exactly in the country's center, the Rincon del Bonete Iam forms an enormous lake. Two power lines carry electricity to Montevideo, 150 miles away. Flatcars on rails haul small boats around the dam. Eventually, two locks will permit larger vessels to navigate this largest Uruguayan river.