Related Clues:

• It goes against the flow
• A river runs to it?
• Beaver endeavor
• Aswan, for one
• Beaver's construct
• Hoover or Aswan
• Hoover --
• Beaver's home
• Levee's big brother
• Beaver's construction
• Obstruction for salmon
• Gardner or Mica, for instance
• China's Three Gorges project
• Grand Coulee or Aswan
• Waterway barrier