The Hibernia Mine Railroad Bridge, constructed in 1879, is the oldest surviving metal truss bridge in Somerset County, the second oldest Phoenix column bridge in New Jersey, and the only one built as a railroad bridge. Built by Clark, Reeves and Co. as a rail-carrying bridge on the Hibernia Mine Railroad in Morris County, New Jersey, it was moved to Mill Lane in Hillsborough Township in Somerset County in 1894 to carry vehicular traffic as part of a grade-crossing elimination project by the Central Railroad of New Jersey. In 1997, the truss was dismantled and stored at the Somerset County Public Works Facility, then reassembled in 2007 as a pedestrian crossing at its present location over the Raritan Power Canal. The bridge is a five-truss pin-connected Pratt through-truss bridge with wrought-iron Phoenix columns, its main structural members, made of four rolled wrought iron segmented sections with flanges riveted together.