Related Clues:

• Moms on all fours
• Beaver projects
• Man-made lake formers
• Water gates
• Beavers' structures
• Bonneville and Hoover
• Stream blockers
• River projects
• Reservoir producers
• Public works projects
• Water flow stoppers
• Beaver constructions
• That's for hers to keep the water back
• Blocks (up)
• Electricity generators