Related Clues:

• Power structure of a sort
• Water barrier used by armada maybe
• Hydroelectric power station
• Remove plaque, in a way
• Moat feature
• Flow barrier
• Obstacle for salmon
• Barrier to picking up what's in Panama disease
• Hydroelectric ___
• Structure with a water turbine
• Keep from streaming
• Part of a hydroelectric plant
• River obstruction
• River-blocking structure
• String that cleans teeth