The Little Pipe Creek bridge and viaduct is a 705-foot (215 m) continuous truss bridge with a main span and 19 viaduct sections as well as an active railroad trestle crossing Little Pipe Creek south of Keymar, Maryland.

In 1915, the bridge was surveyed as part of the Interstate Commerce Commission's effort to establish freight rates for the parent railroad.

Additional work rebuilding the bridge and trestle was performed from 1982 to 1989 by the Maryland State Railroad Administration.

In 1872, Bollman's firm, Patapsco Bridge and Iron Works, completed the bridge and viaducts with a total length of 705 feet, spanning over little pipe creek of 135 feet,[a] trestle consisting of 19 spans, eleven on the Frederick County side and eight on the Carroll County side of the creek.

[5] Under its lease agreement with the State, the operating railroad replaced wooden crossties on the bridge deck in 1980.