Possible Clues:

• Water bank
• 2 3 to keep the water out
• Robert E. Lee waiting spot
• An embankment to prevent a river from overflowing
• 'American Pie' destination
• Flood-control barrier
• Sandbag stack, sometimes
• 'When the ___ Breaks' (old blues song)
• River-flood preventer
• Embankment holding water back