Pennsylvania's Engineering Marvels - Roebling's Delaware Aqueduct

In a quiet and often overlooked corner of Northeastern Pennsylvania, the country's oldest surviving suspension bridge crosses the Delaware River into New York. The Delaware Aqueduct, designed and built by famed engineer John A. Roebling, has withstood a very colorful history from being an important piece in the region's transportation, to uncertainty during the growth of rail, nearly eight decades of neglect and poor management as a private toll bridge, to finally being restored by the National Park Service and in use as an automobile bridge today.

Construction and Canal Era (1847-1898):
During the 1840's, the Delaware & Hudson Canal was looking at ways to speed up service along its route. One of the major bottlenecks was where the canal reached the Delaware River. Since it began operation in 1828, the D&H used a rope ferry to pull traffic along to Canal across the Delaware. The conflicting traffic of vessels going down the Delaware to Trenton or Philadelphia and of the coal freight cutting across the river on the canal created great bottlenecks. That is in addition to the difficulty ferry operators would have fighting the powerful current.

In 1847, the D&H commissioned John A. Roebling to construct a suspension bridge that would carry canal traffic above the Delaware. In comparison to then-contemporary designs, Roebling's suspension design allowed for more room for downriver traffic and the dangerous ice floes to pass through. Two years later on April 26, 1849 at a cost of $41,750, Roebling's Delaware Aqueduct opened to canal traffic. Soon thereafter, a sister suspension aqueduct, the Lackawaxen, was opened nearby at a cost of $18,650. (1) The two bridges' impact were immediate and impressive as canal traffic was shortened by one full day. The D&H was so impressed by the success and the bottom-line impact of the two bridges that they commissioned Roebling to design and construct another two. Two years later, Roebling finished the construction of the Neversink and High Falls Aqueducts in New York.

Eight Decades of Neglect (1901-1980):
As railroads grew throughout the country, the need for canal traffic drastically declined. In 1898, the D&H ceased operations. Three of the four aqueducts, Neversink, High Falls, and Lackawaxen, were dismantled. The Delaware, which still had a great deal of practical purpose as it crossed a major river, was sold to a private owner. The owner, Charles Spurks, used the now dry aqueduct to haul logs for his lumber company across the bridge. He built a toll house on the New York side of the river charging a toll to all others on the crossing.

The bridge would change hands several times during the next 70-plus years. As ownership changed, the condition of the bridge deteriorated. The towpaths were dismantled, replaced by a handrail. In 1933, the trunk of the bridge burned away completely. Only the bridge deck was replaced, the walls of the aqueduct were not replaced. A near tragedy occurred in 1977, when a truck fell through the bridge. A lawsuit was filed against the then owners, but the bridge was only closed temporarily. The condition of the bridge deck was so bad that one member of the park service said, "All one had to do was hop up and down on one end, and I could see a ripple running all the way from Pennsylvania to New York." (2) In 1980, the National Park Service bought the bridge and closed the structure in the hope to restore it.

Restoration and Revival (1980-present):
Once the National Park Service owned the aqueduct, discussions and planning began on how to restore the bridge. Before the bridge was under the Park Service control, the bridge was deemed in 1968 to be a National Historic Landmark. In 1983, testing began on the strength of the bridge, and amazingly Roebling's original provisions easily met modern standards. With most of the original superstructure intact, restoration began in 1985. The restoration of the superstructure's base to Roebling's original specification was complete in 1986. In 1995, the aqueduct walls, towpaths, and wooden icebreakers at the base of the piers were completed.

Today, the bridge is again open to vehicular traffic, without tolls. It is a one lane bridge, and the former towpaths serve as sidewalks. The toll house on the New York side remains and now serves as a history center detailing the history of the aqueduct, the D&H Canal, along with the restoration process. With all original features of the bridge restored, crossing the bridge is like going back in time; the only difference, you don't need a boat to cross it.

Aqueduct Photos:
All photos taken by the webmaster; October 29, 2006.

	Left Photo: Looking downstream at the Delaware Aqueduct from the Pennsylvania shore of the Delaware. Right Photo: The 1995 restoration of the aqueduct's walls and towpaths fully restored the bridge to its original look.
	Left Photo: Looking across the aqueduct into New York. 150 years ago, you would be underwater here. Right Photo: The workings of the suspension superstructure is shown through glass partitions.
	Left Photo: From the towpath, more of the suspension superstructure. Right Photo: The addition of the aqueduct walls and towpaths creates an almost tunnel like ride for vehicles crossing the bridge.

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Sources & Links:

(1) McCann, Brian. "John Roebling and the Delaware Aqueduct." Pocono Lake Region Realtor. (April 1, 2007)

(2) Cobb, Emma. "Roebling's Bridge of Water." Invention & Technology Magazine. Vol. 2, Issue 1. Summer 1986. Hosted by: americanheritage.com (April 1, 2007)

Roebling's Delaware Aqueduct ---National Park Service

Roebling's Delaware Aqueduct ---Bridgemeister.com

Roebling's Aqueducts ---New Visions Digital Publishing

Delaware Aqueduct on the D&H Canal ---American Society of Civil Engineers

Boxing Week Blowout - Roebling's Aqueduct and Barryville Bridge ---Charles Slater

Roebling Inn on the Delaware

Page Created: April 15, 2007
Last Updated: April 15, 2007