Erdman Anthony provided in-depth bridge inspection, survey and mapping, and comprehensive design services for the rehabilitation of the Military Road Bridge over Mill Creek. This locally administered federal aid project improved the structural condition of the existing bridge, which provides an important link to Sackets Harbor, a popular tourist destination and boating area. The historic stone arch bridge, built in 1815, is listed on the National Register of Historic Places as a contributing component of the Madison Barracks Historical District. In 1817, veterans of the American Revolution greeted President Monroe at the bridge with a 19-gun salute.
Our team coordinated extensively with the State Historic Preservation Office to ensure that the bridge's historical characteristics were not compromised during the reconstruction. The existing rubble-stone arch barrel was temporarily supported on shoring to allow construction of a new reinforced concrete arch over top of the existing arch. The concrete arch was added for structural redundancy to maintain the appearance of the stone arch. Erdman Anthony's design included replacing the stone spandrel walls, retaining walls, and parapets with conventional reinforced concrete walls, which were faced with stone veneer salvaged from the original walls. Replacing the stone retaining walls, one of which collapsed during design, enhanced the structural integrity and capacity of the overall bridge to accommodate current loading demands. In addition, the existing steel-pipe railing was replaced with an ironwood approach railing that further contributed to the structure's historical ambiance.
Erdman Anthony improved the roadway profile over the bridge to increase sight distance and lessen vehicular impact on the structure. Our team developed a maintenance- and protection-of -traffic plan that provided a short off-site detour to minimize traffic impacts during construction. Erdman Anthony's innovative design produced a modern bridge within a historic structure that will continue to serve as a functional bridge while celebrating the community's cultural heritage.
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Erdman Anthony is a multidisciplinary firm specializing in infrastructure engineering and support services.
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