AIT Composites’ arch bridge and beam bridge systems have been specifically chosen in several states for project sites in environmentally sensitive habitats. AIT Composites’ bridges have proven to be sustainable and cost-effective alternatives to traditional bridge construction. These bridges have 100+ year life spans and require little-to-no-maintenance. They are installed at a much quicker rate and last longer than traditional concrete and steel bridges, without the risk of corrosion. There is no worry of water leeching of the materials into the stream below and surrounding habitat. Most notably, the Loutsis Creek Bridge in Duvall, Washington and the Grist Mill Bridge in Hampden, Maine are two recent bridges that AIT Composites have engineered and manufactured that have reduced the carbon footprint in infrastructure with several key features. The Loutsis Creek Bridge is an arch bridge system that was installed as part of Washington State’s fish passage widening program. Washington State Department of Transportation (WSDOT) needed to widen Loutsis Creek for several species of endangered and blocked fish species to be able to migrate through. WSDOT chose this system to widen the passageway because of the short installation time and non-corrosive features of the materials used. Another bridge replacement project that was installed in the sensitive surrounding habitat was the Grist Mill Bridge, above the Souadabscook Stream in Hampden, Maine. The Grist Mill Bridge replacement project also required widening of the stream for endangered fish species to migrate through. This time, a composite tub girder bridge system was used. The use of FRP composites is now becoming synonymous with sustainability in the infrastructure industry.