The Keniston Bridge is a historic covered bridge in Andover, Merrimack County, New Hampshire, carrying Bridge Street over the Blackwater River. Built in 1882, it is of Town Lattice through truss construction and is one of the few surviving 19th-century covered bridges in the state. It is also one of the only ones whose sides are not fully sheathed, exposing the trusses.

The Keniston Bridge is located in a rural setting west of Andover's main village. It is a single-span Town truss, mounted on granite bridge abutments that have been partially rebuilt in concrete. Much of the fabric of the bridge is original, although strengthening elements (wooden chords and steel beams) have been added to the trusses and the roadbed, and portions of the downstream truss have been replaced. The bridge is topped by a wooden shingle roof and the distance between the abutments on which it rests is 51 feet. It is also called Bridge Number 15.

The bridge was built by a local builder, Albert Hamilton, and underwent repairs and renovations in 1949 and 1981. Most of the strengthening elements enabling it to carry heavier loads have been effectively hidden behind its sheathing or beneath its main structure. The bridge has survived in part because it is on a minor road that sees very little traffic.

In 1981 the Keniston Covered Bridge was removed by cranes and placed next to its current location for repairs. The bridge repairs needed to happen quickly as the temporary location was only a few feet above the water level. Any rise in water level would have swept the Keniston Covered Bridge downstream.

Dimensions:  Length of largest span: 52.2 ft.;  total length: 65 ft.;  deck width: 8.9 ft.;  vertical clearance above deck: 11.7 ft.

Posted to the National Register of Historic Places on March 16, 1989.

Located at:  N43 26.099    W71 50.167     -     WGCB #29-07-02

Photographed in June 2022