The 1872 Lower Cox Brook Covered Bridge is a wooden covered bridge that crosses Cox Brook in Northfield, Vermont on Cox Brook Road in Washington County. Built in 1872, it is one of five surviving 19th-century covered bridges in the town, and the only place in Vermont where two historic bridges are visible from each other.

The Lower Cox Brook Covered Bridge is one of three 19th-century covered bridges that carry Cox Brook Road within a span of 0.25 miles near the village of Northfield Falls. Its builder is unknown. The three Northfield bridges stand within a quarter-mile of one another. The Northfield Falls Covered Bridge, from which this bridge is visible, spans the Dog River near the mouth of Cox Brook, while this bridge and the Upper Cox Brook Covered Bridge both span Cox Brook. The Slaughterhouse Bridge stands slightly below the three bridges. This bridge is a Queen post truss design, 56.5 feet long and 18.5 feet wide, with a roadway width of 15.5 feet (one lane). It is covered by a metal roof, and its exterior is clad in vertical board and batten siding painted red. The siding extends a short way into each portal. The bridge rests on abutments that are either stone-faced in concrete or have been completely rebuilt in concrete. The wooden bridge deck is supported by four steel I-beams; the trusses now carry only the bridge's superstructure.

Its bridge deck supports were replaced by I-beams in the 1960s

Three of Northfield's covered bridges stand within a quarter-mile of one another. The Upper Cox, Lower Cox, and Northfield Falls Covered Bridges are closely located on Cox Brook Road, as that road passes over the winding Cox Brook, a tributary of the Dog River. The first of these, the Northfield Falls bridge, was built in 1872 of Town lattice truss construction, a type widely used on many early timber bridges and later in building construction. Additionally, it is the longest bridge in Northfield by far, 137 feet long, more than twice as long as any of the others. The Upper and Lower Cox bridges were built soon after the Northfield Falls, both of queen-post truss construction. This group of bridges is further distinguished as the only place in Vermont where one covered bridge can be seen from the portal of another, as is possible from the Lower Cox and Northfield Fall bridges.

The Lower Cox Brook Bridge is sometimes called the Middle Bridge because of its position.

The original stone abutments were faced with concrete when the roadway was strengthened with steel I-beams in the 1960s and the bridge was painted red in 1978.

It was listed on the National Register of Historic Places in 1974.

Located at:  N44 10.363    W72 39.176     -     WGCB #45-12-10

Photographed in June of 2022