Related Clues:

• Beavers' creations
• River barriers
• Glen Canyon and Grand Coulee, e.g.
• River blockers
• Kid producers
• Floodgates
• Hydroelectric structures
• Blocks the flow
• Some power producers
• Blocks off
• Creek blocker
• Hydroelectric power projects
• Water barriers
• Beavers make them
• Hoover, etc.