The Watts Mill Bridge is a pin-connected Pratt pony truss bridge located over the Little Beaver Creek in Cannelton, Pennsylvania, United States.

The bridge is located in a valley approximately a 1/8 mile west of the North Country National Scenic Trail.

The bridge and adjacent Mill remains were listed on the National Register of Historic Places in 1988.

It is the only bridge in Beaver County on the National Register for itself,[2] although the Bridgewater-Rochester Bridge over the Beaver River is part of the Bridgewater Historic District in Bridgewater to the south.

[3] In 2004, the bridge, which was becoming rusty and falling into disrepair and considered for demolition by PennDOT, was placed on the Top Ten Best Historic Preservation Opportunities in the Pittsburgh Area by the Young Preservationists Association of Pittsburgh.