Related Clues:

• 'When the ___ Breaks' (old blues song)
• Robert E. Lee waiting spot
• Flow blocker
• Water stopper
• Beaver project
• See 88-Across
• Stop the flow of
• Dental device
• Water bank
• Mate of 60-Down
• River wall
• Beaver building
• Power tool?
• Dental ___
• Reservoir creator