Atlantic salmon in the United States are critically endangered. Hatchery and stocking programs have kept them from disappearing entirely, but experts say recovering healthy, wild populations will require much more, including eliminating some of the obstacles (literally) standing in their way.
And there's a lot at stake. One of those key places is the Penobscot, which has already seen a $60 million effort to help recover salmon and other native sea-run fish. A 16-year project resulted in the removal of two dams, the construction of a stream-like bypass channel at a third dam, and new fish lift at a fourth. In all, the project made 2,000 miles of river habitat accessible. Source: EcoWatch