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Thomas Viaduct is a whitewater take-out point on the Patapsco River in Baltimore County, Maryland. This location serves paddlers running the whitewater sections of the Patapsco and provides access to take out after downstream whitewater runs. The site is situated near the historic Thomas Viaduct, an iconic stone railroad bridge that spans the river. As a take-out location for whitewater paddling, this site is typically used by kayakers and canoeists finishing intermediate to advanced runs on the Patapsco.