Thanks in large part to a proposal to dam a tributary upstream of Lake Lanier, the Chattahoochee River has landed on a top 10 list of endangered rivers in the country today. The Chattahoochee, at the center of a decades-long struggle between Georgia, Florida and Alabama over control of its water, is the only river in the Southeast to make this year’s list, which is compiled annually by the American Rivers organization. The river has made the list three other times, but the group hasn’t called the river “endangered” since 2000.