Related Clues:

• Water stopper
• Beaver project
• See 88-Across
• Stop the flow of
• Dental device
• Mate of 60-Down
• Beaver building
• Power tool?
• Dental ___
• Reservoir creator
• Flow checker
• Gardiner or Mica
• River block
• A river runs to it
• China's Three Gorges, for one