Archive for the ‘brooklyn bridge’ Tag

Roebling bridges

John and Washington Roebling, the father-son engineering duo, and best known for their Brooklyn Bridge in New York, finished in 1883. They also designed a number of bridges across the nation, here are a few of them.

Starting about 80 miles from New York, across a peaceful Delaware River, is the Delaware Aqueduct, also known as the Roebling Bridge (1849), which used to carry river traffic to relieve traffic on a crowded, busy river. Yes, it’s a suspension bridge, with the tops of the main cable visible at the ends of the bridge. While this once carried water and barges, it’s now been converted into a one-lane bridge. What’s seen today is mostly a remodeling job done by the National Park Service to restore it to its near-original appearance (minus the water).

Roebling Bridge and Delaware River

Roebling Bridge and Delaware River

The Wheeling Suspension Bridge in Wheeling, WV, was the longest span in the world when completed in 1849, linking Wheeling Island with downtown Wheeling. While it has been rebuilt and strengthened over various periods, this is the oldest suspension bridge still in use in the U.S., although only able to handle a limited number of cars on the deck. The original structure was not by Roebling, he had proposed a more conservative structure, but ultimately the design went to Charles Ellet, Jr., who aimed big and designed a large, 1000 foot+ span. After the deck was destroyed during a windstorm in 1854, the bridge was rebuilt. The original deck apparently collapsed under similar circumstances as the original Tacoma Narrows Bridge in 1940, attributed to aerostatic flutter that led to the bridge vibrating at its natural resonance frequency. Washington Roebling designed the cables during a remodeling / reconstruction in 1870, and that’s more or less how the bridge has looked since then. The cable design should be familiar to anyone who’s seen a picture of the Brooklyn Bridge. This one is on a smaller scale, but still has an impressive 1010 foot center span, and a nifty asymmetry. The bridge deck level slopes downward in the center towards the level of the island. It’s a worthy part of the National Road (US 40), and one of America’s great unknown structures. The city of Wheeling is a shadow of its former self, but yet might come back.

Wheeling Suspension Bridge from downtown

Wheeling Suspension Bridge from downtown

Looking towards Wheeling Island

Looking towards Wheeling Island

Further downstream on the Ohio River is the Roebling Bridge that links Cincinnati, Ohio, with Covington, Kentucky, this one being the direct ancestor of the Brooklyn Bridge. Finished in 1866, it lacks the Gothic features of the Brooklyn Bridge, but has the signature cable pattern and rugged towers. This one out-spanned the Wheeling Bridge by a few feet, with a center span of 1057 feet. Depending on which way you look, the view of the bridge and the Cincinnati skyline today is little changed from 80 years ago. It was also notable that the construction of the span continued during the Civil War, for military purposes, but could be interpreted as a political move to connect a northern state with a state that did not formally secede from the Union, but had mixed views on slavery, balanced with practical concerns about trade and transportation.

And a view from the top of the Carew Tower

And a view from the top of the Carew Tower

Roebling Bridge, Cincinnati, tower detail

Roebling Bridge, Cincinnati, tower detail

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The Brooklyn Bridge

This is one of the must-do walks in New York, both for residents and visitors. Two bridges in New York were mentioned by Le Corbusier in his 1947 book When the Cathedrals were White, one being the George Washington Bridge, then a teenager, the other being the Brooklyn Bridge, a mature 60-something at the time.

” Brooklyn Bridge, which is old. . . is as strong and rugged as a gladiator, while the George Washington Bridge, built yesterday, smiles like a young athlete. In this case the two large Gothic towers of stroke are very handsome because they are American and not ‘ Beaux-Arts.’ They are full of native sap . . .”

Like the George Washington Bridge, it’s a noisy walk, with traffic roaring beneath, but the poetry of the bridge lies in the cables, which surround you like a spider web when you walk close to the towers. The walkway, in the center of the bridge, is suspended  above the traffic, and the cables and the bricks become part of the panorama of New York as you walk it, the skylines of midtown and the financial district poking through the web. On a sunny day, it can feel as crowded as Manhattan, with enough human and bike traffic to feel like Times Square, with dozens of languages overheard.

Gothic glory.

It’s an overbuilt bridge, on purpose, in the days before aerodynamics or computers, the towers are squat and solid from a distance, and yet the structure comes across as being delicate from up close. I don’t think Roebling anticipated the amount of traffic that crosses the bridge daily, and yet, the bridge has stood up to all of it, and has weathered the last 130 years of glory and cataclysm in the city.

Tower up close.

Next stop, the Manhattan Bridge. . .