How to Build a Bridge

Of the many types of bridges, the simplest is the beam bridge, which can be as simple as a log placed over a creek.

You will need

  • 4 concrete pier blocks
  • A level
  • A shovel
  • Hand tools
  • Two support beams
  • Four metal straps
  • Planks
  • Nails or bolts
  • The load for the bridge
  • Firm
  • dry ground (optional)

Step 1 Study the location Decide where to put the bridge. Measure the space and assemble your materials, keeping in mind the carrying capacity of the materials you select.

Step 2 Position two pier blocks Place two concrete pier blocks in the ground at one end of the bridge site. The blocks will support the beams. Use a shovel and hand tools to level the blocks.

Step 3 Attach the beams first set of blocks Rest the beams on the two blocks so that they extend across the bridge’s span. Attach the beams to the blocks with metal straps.

Step 4 Add planking Cover the two beams crosswise with wooden planks and nail or bolt the planks to the beams.

Step 5 Test the carrying capacity Test the bridge’s carrying capacity using an appropriate load.