Related Clues:

• Heavy shoes
• Some female parents
• Hoover and Boulder, e.g.
• Hoover and Glen Canyon
• Reservoir makers
• Oroville and Coulee
• TVA structures
• Four-footed mothers
• Water holders
• River stoppers
• Power sources
• Clunky shoes
• Some four-footed parents
• Hoover and others
• Four-footed moms