Roebling Delaware Aqueduct Bridge

John A. Roebling emigrated from Germany and became one of the great engineers of nineteenth-century America, a pioneer of the wire-cable suspension bridge. The Delaware Aqueduct, completed in 1849, was one of his early major works, and in it he worked out the principles of spinning and anchoring the wire cables that would later hold up his most famous creation.

That creation was the Brooklyn Bridge, whose towers and cables Roebling designed and which opened in 1883. He did not live to see it finished. An accident at the site cost him his life early in construction, and his son Washington Roebling carried the great bridge to completion, aided by his wife Emily. The modest Delaware crossing is thus a first draft, in a sense, of one of the most celebrated bridges in the world, and it remains standing while so many later structures have come and gone.

In the mid-1800s, the Delaware and Hudson Canal carried coal from Pennsylvania's mines toward the markets of New York, and its route had to cross the Delaware River. Where the canal met the river, canal boats had once been floated across the open water on a slackwater pool, a slow and dangerous arrangement that clashed with the river's own traffic of log rafts.

Roebling's solution was to lift the canal clear over the river in a suspended trough, a water bridge or aqueduct. Canal boats floated across inside the trough, high and dry above the Delaware, while the river and its rafts passed freely beneath. It was an elegant fix, and it worked for decades until railroads made the canal obsolete around 1900. The aqueduct was then converted to a toll road bridge, its wooden trough replaced by a roadway, and in that form it survived to become a national historic landmark.

Now part of the Upper Delaware Scenic and Recreational River, administered by the National Park Service, the bridge carries a single narrow lane of traffic and a walkway across the Delaware. The stone piers and the wire suspension cables are Roebling's originals, and walking out onto the span you can look down the spinning cables and out over the wide, clear river, understanding at a glance how the later Brooklyn Bridge grew from this idea.

The Delaware here is a protected wild river, clean and quiet, popular with canoeists and anglers and watched over by bald eagles that nest and hunt along the corridor. In winter especially, eagles gather in numbers along this stretch. Standing on the bridge, with the river sliding beneath and forested hills on either bank, it is easy to forget how close this peaceful spot is to the busy Northeast.

Spring brings high, fast water and returning migratory birds, a lively time along the river as the forests leaf out. Summer is the paddling season, when canoes and kayaks fill the Delaware and the bridge makes a scenic landmark on a lazy river day.

Autumn sets the wooded hills of the Upper Delaware ablaze with color, framing the bridge and its stone piers beautifully. Winter is the eagle season, when bald eagles gather along the open water to fish, and the bare trees and quiet make them easier to spot from the bridge and riverbanks.

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