Modern (18th-20th Century)

June 13 -- Dr. D.B. Steinman, designer of the St. John's Bridge, chose a gothic style of architecture with the determined purpose of making the span his most beautiful work, "The gothic arch was made of stone in the mideval days because steel had not been developed. It is really more appropriate in steel. Until recently the public took it for granted that steel bridges had to be utilitarian and unattractive, but now the interest is turning to the development of forms of beauty in steel."

Though accustomed to having the type of bridge left to his discretion, Dr. Steinman & Robinson, Consulting Engineers, worked out and submitted to the county commissioners plans and estimates for both the suspension and the canti- lever forms before the former was finally chosen. His estimate showed that the suspension type, beside from being more suitable for the site, would be $640,000 cheaper than the cantilever style.

Ralph Modjeski, considered "America's greatest bridge builder", was born in Bochnia, near the city of Krakow, Poland on January 27, 1861. He immigrated to America at the age of 15 with his mother, famous Shakespearean actress, Helen Modjeska, in July, 1876. Even though Modjeski seemed destined to become an accomplished concert pianist, he went on instead to become a highly successful civil engineer and "one of the twentieth century's most famous designers and builders of bridges". In 1929, Modjeski was awarded the John Fritz Gold Medal, the highest American engineering medal, with a citation for his genius in combining strength and beauty. He was also honored by the Pennsylvania state legislature in 1966 by a resolution citing him as one of America's "greatest inventors".

We call the confluence of the Harlem and the East Rivers in New York City Hell's Gate. Dramatic, I suppose, but why not! A bridge opened over Hell's Gate in 1917. It's an arch of iron girders. The arch thickens at each end. It thins toward the center. You get a feeling of buoyancy looking at it.

Othmar Ammann, who designed the bridge, caught Hell for it. This, says writer Christopher Bonanos, was an age of ornament, gravity, solidity, and dignity. Ammann's design was imperfect in some ways. But its simplicity, lightness, and freedom signaled a new era in design.

Take a virtual walk across the Mid-Hudson Bridge!! Discover various facts about the bridge. Find out about attractions in the area of the Mid-Hudson Bridge. Learn about how the bridge was conceived, designed, and built.

Othmar Hermann Ammann, partner of the firm Ammann & Whitney, Consulting Engineers, New York, and a member of the National Academy of Engineering, died at his home in Rye, New York, on September 22, 1965, at the age of eighty-six. His passing brought to a close an active, sixty-three-year engineering career during which he came to be known as the "master bridge builder of our time."

John Job Crew Bradfield was born in Sandgate, Queensland on the 26 December 1867. He was educated at Ipswich State School, Ipswich Grammar School and the University of Sydney, where he graduated as a Bachelor of Engineering in 1889. In 1891 he married Edith Jenkins. They had six children.

In 1891 Bradfield joined the New South Wales Department of Public Works as a temporary draftsman, becoming permanent in 1895. He was involved in such major projects as the Cataract Dam and Burrunjuck Dam. In 1909 he became assistant engineer and in 1913 he was appointed chief engineer for metropolitan railway construction. He went overseas in 1914 to study railway construction and in the next few years wrote many papers advocating the electrification of suburban railways. Work commenced on the underground railway in 1923 and the first stations were opened in 1926.

Othmar Herrmann Ammann. Swiss-American engineer and designer of the largest bridges of the city of New York. Born on 26 March 1879 in Feuerthalen bei Schaffhausen, Zurich, Switzerland. Deceased on 22 September 1965 in Rye, New York, USA. Associated with the following firms:Formerly: Triborough Bridge Authority. Technical director(s), Port of New York Authority. Founder(s), Ammann & Whitney.

This an historic occasion. Today we are gathered here to dedicate a famous pioneer structure -- the oldest cable suspension highway bridge in the world -- as a national monument. Because this span has played a dramatic and significant role in the development of bridge engineering, and because its outstanding record of more than a century of distinguished service is interwoven with the unfolding panorama of American history, it is altogether fitting and proper that the shrine to thrill and inspire future generations.

When this great structure -- the first bridge over the Ohio River -- was completed in 1849, it was truly notable achievement. Its span of 1,010 feet was by far the longest in the world, the first time human courage and resourcefulness had achieved a span exceeding one-thousand feet.

One of the most interesting papers presented to the American Society of Engineers at the Seabright Convention is that of Mr. THEODORE COOPER on "American Railway Bridges." It is interesting from the historical matter contained in it, and here first systematically gathered together, and valuable as showing the progress of a branch of engineering that has made our country famous for its works of this nature. The paper is necessarily long, so that we cannot publish it in full, even did the rules of the society permit, and we must content ourselves with the following abstract. We congratulate Mr. COOPER upon the success attending his efforts to unearth and arrange much matter relating to the early history of wooden bridge building that has usually been considered inaccessible.

Aware that control of the country's river systems would important to both sides in the Civil War, Eads proposed the U.S. government invest in the development of steam-powered, ironclad warships. Eads made his proposal before the war, but his idea was coolly received. When he was awarded a contract, he employed upwards of 4,000 men to build the U.S. ironclad armada that would prove decisive in Union efforts against Forts Henry and Donelson, at Memphis, Island No. 10, Vicksburg, and Mobile Bay. In a remarkable feat Eads turned out his first ironclad 45 days after he began production. The ironclad idea would be adopted by the Confederacy and both sides would improve on Eads' idea throughout the war. After the war Eads found a new project, the spanning of the Mississippi with a suitable bridge to carry everything from people to trains. The self-trained engineer proposed a triple-arch design fabricated from steel. Each span was roughly 500 hundred feet and rested on piers resting on bedrock some 100 feet beneath the river bottom. The building of the arches involved steel supplied by Andrew Carnegie's steel works. Eads required that the 18 inch diameter hollow tubes conform to a test strength of 60,000 pounds. Many times during construction steel was returned to be re-rolled so that it might meet Eads' exacting standards. Keeping the shipping lanes open was necessary during construction, so Eads designed a cantilever system to support the unjoined arches. A system of pulleys stretched over the piers and supported the arches. Eads was also innovative in that he employed a threaded iron plug to close the arches. He allowed five inches on each arch to be used for threading the plug and closing the distance between the arches. The Eads Bridge was the largest of its kind and quickly became world renowned.