1846 Bitzer's Mill Covered Bridge is a covered bridge that spans the Conestoga River in Lancaster County, Pennsylvania and is the oldest bridge in the county still in use.

A county-owned and maintained bridge, its official designation is the Big Conestoga #2 Bridge. The bridge is also called Martin's Mill Bridge, Eberly's Cider Mill Covered Bridge, and Fiand's/Fiantz's Covered Bridge.

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. Added later, secondary steel I-beams support the bridge from underneath. The bridge is painted red on the outside, the traditional color of Lancaster County Covered Bridges. The inside of the bridge is not painted. Both approaches to the bridge are painted in the traditional white color. As of July 2006, the bridge has some damage to its sides including some missing or broken panels.

The bridge was built in 1846 by George Fink and Sam Reamsnyder at a cost of $1,115. They used a single-span, wooden, double Burr arch-truss construction. At some point later, steel I-beams were installed under the floor to add support to the oldest bridge in Lancaster County. The bridge has historically been referred to by a number of names that reflected the various mill owners. In 1962, it was proposed to replace the bridge with a concrete span, but the plan was discontinued after much public outcry.

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

In 1980 it was added to the National Register of Historic Places.

Located at:  N40 08.425    W76 09.117    -    WGCB #38-36-04

Photographed in July of 2019.