Three girls stand Thursday evening on the deck behind the Farwell Mill in Lisbon. A significant section of the dam below will be removed and a fishway built to allow fish to make their way upstream. Russ Dillingham/Sun Journal

A woman fishes Thursday evening on the Sabattus River across Lisbon Street from the Farwell Mill in Lisbon where a dam was removed several years ago. Several dams have been removed and fishways constructed to aid spawning fish to make their way up the river. Russ Dillingham/Sun Journal

Three girls stand Thursday evening on the deck behind the Farwell Mill in Lisbon. A significant section of the dam below will be removed and a fishway built to allow fish to make their way upstream. Russ Dillingham/Sun Journal

A woman fishes Thursday evening on the Sabattus River across Lisbon Street from the Farwell Mill in Lisbon where a dam was removed several years ago. Several dams have been removed and fishways constructed to aid spawning fish to make their way up the river. Russ Dillingham/Sun Journal

Casey Clark, left, a scientist from the Maine Department of Marine Resources, talks Thursday evening to people gathered behind the Farwell Mill, background, in Lisbon. Clark is the project manager and one of the speakers during a tour explaining the scope of a major cleanup and restoration project along the Sabattus River. Several dams have been removed and fishways constructed to aid spawning fish to make their way up the river. Russ Dillingham/Sun Journal