The 1880 Mercer's Mill Covered Bridge or Mercer's Ford Covered Bridge is a covered bridge that spans the East branch of the Octoraro Creek on the border between Lancaster County and Chester County in Pennsylvania.  

Mercer's Mill Bridge was built in 1880 by B. J. Carter. Along with the Pine Grove Covered Bridge (built in 1884), it was one of a number of covered bridges built along the border between Lancaster and Chester counties.

The bridge has a single-span, wooden, double Burr arch trusses design with the addition of steel hanger rods. The deck is made from oak planks.  It is painted red, the traditional color of Lancaster County Covered Bridges, on both the inside and outside. Both approaches to the bridge are painted in the traditional white color. The bridge has a single window on one side of the bridge.

Length: 87 feet span

Width: 15 feet 4 inches

Overhead clearance: 11 feet 6 inches

Under-clearance: 13 feet 6 inches

Of the 1,500 covered bridges that once stood in the state of Pennsylvania, as of 2019, approximately 200 remain.

Posted to the National Register of Historic Places on December 11, 1980.

Located at:  N39 55.888    W75 58.896     -     WGCB #38-15-19/38-36-38

Photographed in June of 2010.