It joins Elm Street (New Hampshire Route 135) in South Lancaster with River Road (Town Highway 1) in Lunenburg.

[1] The Mount Orne Covered Bridge is located in a rural area of eastern Lunenburg and southwestern Lancaster.

It consists of two spans of wood-and-iron Howe trusses, resting on stone abutments and piers which have been partially faced in concrete.

The bridge is covered by a corrugated metal gable roof, and is sided in vertical boarding that extends only partway to the eaves.

[3] In November 2023, the bridge was closed (for an as yet undetermined amount of time) due to damage caused by an oversized vehicle driving through it.