Small wooden bridges are typically found over footpaths and small garden streams. Many streams flow heavily only in the spring, so a small wooden bridge is sufficient to provide dry passage from one side to the other. A small wooden bridge may even be used to avoid muddy areas along a hiking path in wet weather while also reducing trail erosion. No matter the use, a small wooden bridge can be constructed from readily available materials.
Position the two 4x4x96-inch landscaping posts parallel to each other approximately 48-inches apart. These form the bottom supports of the bridge.
Lay out each of the 1x4x48-inch deck boards so they rest on top of the landscaping posts. They should be perpendicular to the landscaping posts. These boards become the surface to walk across.
Using a tape measure, space each of the 1x4x48-inch deck boards ½-inch apart. Fasten the boards in place using a screw gun and two ½-inch deck screws. Screw down through each board into the landscaping posts. Space the screws 1-inch in from the end of each board. Place two screws in each board approximately ½-inch in from the side edge of each board.
Carefully lower the assembled bridge into position over the crossing. Once the bridge is in place on either side of the crossing, it is safe to walk across.