By Emmett Gartner of the Maine Monitor The Nature Conservancy will buy the last four dams blocking salmon from their spawning grounds in the Sandy River. The Nature Conservancy on Tuesday announced a landmark investment worth $168 million to purchase and oversee Brookfield Renewable’s four hydroelectric dams on the lower Kennebec River, paving the way for their eventual removal. The sale all but guarantees unfettered access for endangered Atlantic salmon and other seagoing fish from the Gulf of Maine to their historic spawning grounds upstream on the Sandy River for the first time since the Kennebec River was permanently dammed Source