Monocacy Aqueduct, Navigable aqueduct in Frederick County, United States
Monocacy Aqueduct is a stone bridge carrying water across the Monocacy River with seven arches made from locally quarried granite blocks. The structure allowed boats traveling on the Chesapeake and Ohio Canal to cross safely over the river below.
Built and completed in 1833, the aqueduct became a key transportation link on the Chesapeake and Ohio Canal. During the Civil War it narrowly avoided destruction when local canal workers convinced military leaders to preserve it rather than demolish it.
The structure represents a milestone in American civil engineering, designed by Benjamin Wright, who established standards for canal construction across the United States.
The site is accessible through the Chesapeake and Ohio Canal National Historical Park with nearby parking areas and viewing platforms. Wear comfortable shoes since walking trails run along the canal and around the structure.
The structure was built from granite sourced from nearby quarries, showcasing early American stone-cutting techniques that have endured. The quality of the material allowed the bridge to withstand more than a century of river flows and weather.
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