How to build a 6 ft bridge for a garden or a graduation ceremony!

We have 6 kids in my neighborhood graduating from one school  level to another. Elementary to middle school, middle school to high school, high school to college, and 1 parent graduating from college.  We held a graduation party for them which included a small ceremony crossing a bridge.  For my contribution, I built the bridge.  I’m still working on the plans and they should be available soon.