Across
- 4. Passage over obstacle
- 5. Weight of structure itself
- 6. Twisting force
- 8. First to use rope bridges
- 9. Strongest shape
- 11. Added to strengthen against earthquakes
- 13. Sliding on past
- 17. One of the main types of bridges
- 18. Bridge that collapsed resulting in new laws
- 19. Bridge that uses triangles
- 20. Pull apart
Down
- 1. Changing weight on the structure
- 2. Added to strengthen against unstable soil
- 3. Support in an arch bridge
- 7. First to use arch bridges
- 10. Added to strengthen from temperature changes
- 12. Has a keystone
- 14. Squeeze
- 15. Bridge that has a main cable
- 16. Mrs. Wink's favorite