Our bridges are made from CCA-treated lumber encased in steel channel. Our patented Shear Key design allows each bridge to operate as a single, solid structure with weight distributed evenly across the entire bridge. Each bridge is designed for fast, easy installation with a dozer, excavator or boom truck. Our timber bridge systems help meet and exceed Best Management Practices for stream crossings by minimizing stream siltation and erosion during installation, use, and removal of the bridge.