Related Clues:

• Mother among mammals
• Barrier
• Mica, for one
• Shantyboy's concern
• Grand Coulee, for one
• Classic British war film, "The ___ Busters"
• Reservoir's edge
• Beaver job
• Hydroelectric option
• Mica or Gardiner
• Massive impasse
• Beavers' construct
• Lake former, perhaps
• Hydroelectric facility
• Beaver creek project