The 1849 Martin's Mill Covered Bridge is a historic wooden covered bridge located in Antrim Township in Franklin County, Pennsylvania. The bridge is a 205-foot-long (62 m), Town lattice truss bridge which crosses Conococheague Creek, making it the second-longest covered bridge in Pennsylvania.

After Samuel Martin built a sawmill and grist mill on the land along the Conococheague Creek, Martins Mill Bridge was constructed to replace a creek fording, which became impossible to cross when the creek’s water was high. Martins Mill Bridge was built under the direction of Jacob Shirk. Its Town Lattice truss design uses no arches or exterior supports and was considered strong enough to support a bridge up to 200 feet in length. It was less costly to build than traditional arch-supported bridges. Wanting to assure sturdy construction, a stone support was added halfway across the bridge.

In 1973, the bridge was rehabilitated after being carried downstream by flood waters during Hurricane Agnes. Steel bracing was added at a later date to stabilize the bridge. In spite of being altered over the years due to destruction and restoration, it remains a good example of this type of covered bridge design and contains approximately two-thirds of its original timbers. It was raised five feet to help keep it from being destroyed by another flood. It is one of only two covered bridges in Franklin County and is the largest lattice-type bridge in Pennsylvania.

The bridge was rededicated after a fourth renovation was completed. The process of planning and funding the fourth renovation began in 2007. The total cost to renovate Martin’s Mill Bridge was $1.1, of which $700,000 was allocated from the Federal Highway Administration Covered Bridge Preservation Program. Work included installation of a steel support beam, new siding and portals, replacement of the roof, replacement of decayed wooden structural pieces, and staining.

The grounds around the bridge include a pavilion, grill area, picnic tables, and restroom facilities. The facilities are primitive with no electricity or running water.

Martin’s Mill Bridge was listed on the National Register of Historic Places in 1974.

Located at:  N39 45.896   W77 46.543      -      WGCB #38-28-01

Photographed in June of 2025

Photos by Millard Farmer