Great Sacandaga Lake, in the southern part of Adirondack Park, is the second largest lake in the Adirondacks (after Lake George), and was created in 1930, when the Sacandaga River was flooded by the Conklingville Dam. The dam was built to control flooding on the Hudson, but more than a thousand people were forced to move from their homes along the Sacandaga River, and several historic communities were flooded. The dams of the Sacandaga make electricity, too, as do dozens of other dams in the Adirondacks that have small hydroelectric plants. A total of around 260 megawatts of power is produced inside the park. Most of the rivers of the Adirondacks are dammed, and most of the major lakes are artificially constructed.