The Arch Bridge from the Boonton Ironworks crosses the Rockaway River in Grace Lord Park in the town of Boonton in Morris County, New Jersey. The single-span fieldstone arch bridge was built by John Carson Sr. in 1866 to carry a water pipe to the ironworks. It was added to the National Register of Historic Places on September 1, 2022, for its significance in engineering. It is currently used as a pedestrian bridge.
In 1866, Fuller & Lord, operators of the ironworks, hired local mason John Carson Sr. to construct a fieldstone arch bridge to carry a water pipe across the Rockaway River in the Boonton Gorge. The pipe would provide a reliable source of water for fire protection at the ironworks. Water from the Morris Canal was not always available. The bridge width is and the length is .
In 2020, the New Jersey Historic Trust funded the stabilization and restoration of the bridge, located in the New Jersey Register of Historic Places state-designated Boonton Ironworks Historic District. In 2023, it was listed as a key contributing structure of the Boonton Ironworks Historic District.