The Old Mill Road Bridge is a historic bridge near Rocky Ridge, Frederick County, Maryland, United States. The bridge spans Owens Creek southwest of Rocky Ridge on Old Mill Road. It is a Pratt half-hip through truss structure in a single span 69 feet (21 m) long and 16 feet (4.9 m). It was built in 1882 by the Pittsburgh Bridge Company, Pittsburgh, Pennsylvania.
The Old Mill Road Bridge was listed on the National Register of Historic Places in 1979.
Media related to Old Mill Road Bridge at Wikimedia Commons
- Old Mill Road Bridge, Frederick County, including photo in 1977, at Maryland Historical Trust
- Historic American Engineering Record (HAER) No. MD-36, "Old Mill Road Bridge, Spanning Owens Creek on Old Mill Road, Rocky Ridge, Frederick County, MD", 6 photos, 2 color transparencies, 3 data pages, 2 photo caption pages