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Tunkhannock Viaduct

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Carries
  
railroad traffic

Design
  
Total length
  
2,375 feet (723.9 m)

Opened
  
6 November 1915

Location
  
Nicholson

Crosses
  
Tunkhannock Creek

Material
  
Construction started
  
May 1912

Height
  
73 m

Tunkhannock Viaduct

Address
  
PA-92, Nicholson, PA 18446, USA

Similar
  
Starrucca Viaduct, Steamtown National Historic S, Paulinskill Viaduct, Delaware River Viaduct, Great Smoky Mountains

Rare capture at tunkhannock viaduct nicholson bridge nicholson pa


Tunkhannock Creek Viaduct (also known as the Nicholson Bridge and the Tunkhannock Viaduct) is a concrete deck arch bridge that spans Tunkhannock Creek in Nicholson, Pennsylvania, in the United States. Measuring 2,375 feet (724 m) long and towering 240 feet (73.15 m) when measured from the creek bed (300 feet (91.44 m) from bedrock), it was the largest concrete structure in the world when completed in 1915 and still merited "the title of largest concrete bridge in America, if not the world" 50 years later.

Contents

Built by the Delaware, Lackawanna and Western Railroad (DL&W), the bridge is owned today by Norfolk Southern and is used daily for regular through freight service.

The DL&W built the viaduct as part of its 39.6-mile (63.7 km) Nicholson Cutoff, which replaced a winding and hilly section of the route between Scranton, Pennsylvania, and Binghamton, New York, saving 3.6 miles (5.8 km), 21 minutes of passenger train time, and one hour of freight train time. The bridge was designed by the DL&W's Abraham Burton Cohen; other key DL&W staff were G. J. Ray, chief engineer; F. L. Wheaton, engineer of construction; and C. W. Simpson, resident engineer in charge of the construction. The contractor was Flickwir & Bush, including general manager F. M. Talbot and superintendent W. C. Ritner.

History

Construction on the bridge began in May 1912 by excavating all 11 bridge piers to bedrock, which was up to 138 feet (42 m) below ground. In total, excavation for the viaduct removed 13,318,000 cubic yards (10,182,000 m3) of material, more than half of that rock.

Almost half of the bulk of the bridge is underground. At mid-construction, 80,000 cubic yards (61,000 m3) of concrete had gone into its substructures, and it was estimated that construction would require 169,000 cubic yards (129,000 m3) of concrete and 1,140 short tons (1,030 t; 1,020 long tons) of steel. The steel estimate proved accurate; the bridge ultimately used a bit less concrete than expected: 167,000 cubic yards (128,000 m3), making the total weight approximately 670,000,000 pounds (300,000,000 kg).

The bridge was dedicated on November 6, 1915, along with the opening of the Nicholson Cutoff.

Construction photos along with a short history of the bridge were published by the Nicholson Area Library in a brochure in 1976. It was listed on the National Register of Historic Places on April 11, 1977.

Since 1990, the local community has celebrated the building of the bridge on the second Sunday of September with "Nicholson Bridge Day", a street fair, parade, and other activities. The 100th-anniversary celebration was held in September 2015.

References

Tunkhannock Viaduct Wikipedia


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