Related Clues:

• Levee
• Mother
• Hoover ___
• Dutch embankment
• Fort Peck ___, in Montana
• Spill checker?
• Gatehouse site
• 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.