Related Clues:

• Lake former
• Lake maker
• Sea wall relative
• River barrier
• TVA project
• Gardiner, for one
• River-flood preventer
• It retains water
• Keep from running
• Thoroughbred's mother
• Leave it to beavers
• Beaver barrier
• Block the flow
• Beaver's oeuvre
• 'When the ___ Breaks' (old blues song)