dam
a large barrier built across a river, stream, or valley typically made of concrete, stone, or earth may have a spillway or sluice gate to regulate the flow of water may have turbines or other water-powered mechanisms for generating electricity may have floodgates to control the flow of water may have a fish ladder or other features to help migrating fish pass
dam which is a large barrier built across a river, stream, or valley dam which typically made of concrete, stone, or earth dam which may have a spillway or sluice gate to regulate the flow of water dam which may have turbines or other water-powered mechanisms for generating electricity dam which may have floodgates to control the flow of water dam which may have a fish ladder or other features to help migrating fish pass