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Related Clues:
- You progress down some waterways and get to this barrier...which bursts and capsizes your boat. See 70-across.
- 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