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İzmit Bay Bridge

Izmit Bay Bridge
Construction site in 2015
Carries 6 lanes of motorway
Crosses Izmit Bay
Locale Izmit, Turkey
Maintained by
  • Nömayg - Nurol, Özaltın, Makyol, Yüksel, Gocay
Design Suspension
Material steel, foundation structures: concrete
Total length 2,682 m (8,799 ft)[1]
Width 35.93 m (117.9 ft)[1]
Height 234.425 m (769.11 ft) (pylons)[1]
Longest span 1,550 m (5,090 ft)[1]
Clearance above 64.3 m (211 ft) x 1,000 m (3,300 ft)
Architect Dissing+Weitling
Engineering design by COWI A/S
Constructed by IHI Corporation
Construction begin 2013
Construction end 2017
Daily traffic approx. 35,000 vehicles per week
Toll $35[2]
Izmit Bay Bridge is located in Turkey
Izmit Bay Bridge
Location in Turkey

The Izmit Bay Bridge (Turkish: İzmit Körfez Köprüsü) is a suspension bridge under construction, located at the Gulf of İzmit along the eastern end of the Sea of Marmara, in close vicinity of Izmit and approximately 50 km (31 mi) southeast of Istanbul, Turkey. When completed, it will be the fourth-longest suspension bridge in the world by the length of its central span.


  • Project 1
  • Design 2
  • Accident at construction site 3
  • See also 4
  • References 5
  • External links 6


Construction and operation of the bridge was awarded to a joint venture formed by five Turkish companies (Nurol, Özaltın, Makyol, Yüksel and Gocay) and one Italian construction company Astaldi following the international Build–operate–transfer tender that took place in April 2009.[3][4] As of 2010, the contract was signed for the project that is estimated to cost 11 billion for the entire highway from Gebze to Bursa. After the completion of the bridge, the distance between Istanbul and İzmir will shorten about 140 km (87 mi) bypassing the long-stretched Gulf of İzmit. The projected highway of 420 km (260 mi) length with the bridge will reduce the travel time between the two major cities from six-and-half hours to three-and-half hours. The construction is expected to be completed in 2017.[5][6]

On March 30, 2013, Prime minister Recep Tayyip Erdoğan laid the groundstone for the bridge.[7]


The US$1 billion privately financed bridge, designed by Danish engineering design firm COWI A/S and architecture firm Dissing+Weitling,[5] will connect the northeastern and southeastern coast of the Izmit Bay, significantly reducing regional travel time. Crossing the bay, the bridge and the connecting highway will provide three lanes of traffic in each direction.

The most important dimensions are:[5][4]

  • main span length: 1,550 m (5,090 ft)
  • side spans length: 566 m (1,857 ft)
  • clearance: 64 m (210 ft)
  • tower height: 234.4 m (769 ft)
  • tower size (at the base): 8 m × 7 m (26 ft × 23 ft)
  • deck size: 30.10 m × 4.75 m (98.8 ft × 15.6 ft)

The bridge will be fourth longest suspension bridge in the world.[8]

Accident at construction site

At about 15:30 local time on March 21, 2015, during the construction works at the bridge, the eastern side cable carrying the catwalk broke away from its bolted joint on the south tower, and fell into the water. Spanned in February 2015, the catwalk is needed to allow workers access to the other side of the bay. No one was harmed by the accident as work was interrupted at this section due to windy weather. Marine traffic to and from İzmit Bay was suspended following the accident for security reasons, and resumed after recovering the cable in the morning of March 23.[9][10]

Kishi Ryoichi, the 51-year-old Japanese engineer of the IHI-Itochu Consortium, who was in charge of the construction at site, committed suicide by cutting his wrist and throat with a blade knife. He was found dead at the entrance of the cemetery near his lodging in Altınova. He left a note in Japanese language saying that "This failure ends my private and professional life. This project was mine and my country's pride. No one else is responsible for this failure."[6] [10][11][12]

See also


  1. ^ a b c d
  2. ^
  3. ^ Turkey Infrastructure Report Q4 2009
  4. ^ a b "Körfez köprüsü dünya dördüncüsü olacak".  
  5. ^ a b c "Izmit Bay bridge". Dissing+Weitling architecture. Retrieved 2013-03-31. 
  6. ^ a b "Japanese engineer commits suicide after İzmit bridge cable snaps".  
  7. ^ "İzmit Körfez Geçişi Asma Köprüsü'nün Temeli Atıldı". Son Dakika (in Turkish). 2013-03-30. Retrieved 2013-03-30. 
  8. ^ "Bu otoyolla İzmir-İstanbul 3.5 saate iniyor".  
  9. ^ "Körfez Köprüsü'nde kablo koptu".  
  10. ^ a b "Dev projenin mühendisi ölü bulundu".  
  11. ^ "Körfez Geçiş Köprüsü'nde çalışan Japon mühendis intihar etti".  
  12. ^ "İzmit Körfez Geçiş Köprüsü Halatı Koptu, Japon Mühendis İntihar Etti".  

External links

  • Izmit Bay Bridge at Structurae
  • Description of the project
  • Otoyol A.Ş. – project to connect Gebze and İzmir with a highway crossing Izmit Bay
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