Related Clues:

• It can hold its water
• Lake maker, perhaps
• Block, in a way
• Block up
• Flood preventer
• Mississippi feature
• Don McLean drove his Chevy here
• Hoover or Tarbela, e.g.
• Sire's counterpart
• River sight
• Flood-control embankment
• Actor Dick Van ___
• Flood control
• Dutch tourist attraction
• Paddock parent