The Moores Crossing Railroad Bridge is a historic bridge in Manchester, New Hampshire. It was built in 1887 by the Boston and Maine Railroad to carry trains across the Merrimack River. The bridge is a steel truss structure with a total length of 1,200 feet and a main span of 300 feet. The bridge was named after Samuel Moore, a prominent local businessman who owned land near the crossing. The bridge was in use until 1976 when it was closed to rail traffic. It was listed on the National Register of Historic Places in 1980. Today, the bridge is part of the Bedford Heritage Trail that connects Manchester with neighboring towns.

The Merrimack River is a 117-mile-long river in the northeastern United States. It rises at the confluence of the Pemigewasset and Winnipesaukee rivers in Franklin, New Hampshire, flows southward into Massachusetts, and then flows northeast until it empties into the Atlantic Ocean at Newburyport. From the point where the Merrimack turns northeast in Lowell, Massachusetts onward, the Massachusetts–New Hampshire border is roughly calculated as the line three miles north of the river.