At Miniskink Ford along Route 97, the Upper Delaware Scenic and Recreational River is the home of the oldest suspension bridge in the country—the Delaware Aqueduct, or the Roebling Bridge. Construction started in 1847 as one of four suspension aqueducts on the Delaware Hudson Canal; it was designed by and built under the supervision of John A. Roebling, the future engineer of the Brooklyn Bridge. Each 8½-inch-diameter suspension cable carries 2,150 wires bunched into seven strands. The Tollhouse, on the Minisink Ford side of the bridge, contains self-guiding exhibits and historic photographs. The D&H Towpath Trail is a 1-mi stroll along the 1828 towpath. The bridge itself has a walking path, too.