Related Clues:
- Bonneville and Hoover
- Stream blockers
- River projects
- Reservoir producers
- Public works projects
- Water flow stoppers
- Castle-defending ditches
- Tokyo Imperial Palace features
- Things that drawbridges bridge
- Zoo trenches
- Beaver constructions
- Fortifications filled with water
- That's for hers to keep the water back
- Projects for beavers
- They're crossed by bridges