Traditionally, the choice of the stone used in stone bridges was primarily a reflection on what was locally available. Geological Variances In New England, there are many stunning stone arch bridges made out of the locally available granite boulders. These structures attest to the ingenuity of the masons who were able to create lasting structures using such irregularly shaped material. In the Midwest, the stone arch bridges are typically made of sedimentary rocks — … [Read more...] about The Choice of Stone for Stone Arch Bridges