--- title: Osmangazi Bridge slug: osmangazi-bridge-2f937 url: /detay/osmangazi-bridge-2f937 type: article language: English entity: primary: Osmangazi Bridge type: article disambiguation: Osmangazi Bridge: Türkiye's impressive suspension bridge, connecting Istanbul & Izmir. Reduced travel time significantly! categories: - name: General Knowledge slug: genel-kultur url: /kategori/genel-kultur - name: Transportation And Logistics slug: ulastirma-ve-lojistik url: /kategori/ulastirma-ve-lojistik - name: Architecture And Construction slug: mimarlik-ve-insaat url: /kategori/mimarlik-ve-insaat tags: - Structural Health Monitoring - Build-Operate-Transfer - Istanbul-Izmir Motorway - Osmangazi Bridge - suspension bridge author: Sümeyye Akkanat Terzioğlu created_at: 2025-05-26T18:11:46.776981+03:00 updated_at: 2025-06-13T15:18:15.214493+03:00 image: https://cdn.t3pedia.org/media/uploads/2025/05/26/kfwAU6XllfqU7DF4A6hItQHazeqpbeuq.webp --- # Osmangazi Bridge ## KURE Information Cards ![tuo1teo4PnqscdAPMTo6eqDXttcIhcB8.webp](https://cdn.t3pedia.org/media/uploads/2025/05/26/tu5WPqOH4eCjRLeQhVQv5BCQeb5JYmtK.webp) | Field | Value | |-------|-------| | Opening Date(s)(Text) | June 30-2016 | | Construction Start Date | March 30-2013 | | Number of Lanes | 6 (3 in each direction) | | Tower Height | 252 meters | | Deck Width | 35.93 meters | | Main Span (Central Section) | 1550 meters | | Total Length | 2682 meters | | Bridge Type | Suspension bridge | | Geographical Feature | Gulf of İzmit | | Location | Gebze (Kocaeli) – Altınova (Yalova),Türkiye | ## Article Content **The Osmangazi Bridge** is a suspension bridge located in northwestern Türkiye, constructed between [Gebze](/en/detay/gebze-district-2dc1a/llms.txt) and [Altınova](/en/detay/altinordu-district-6c509/llms.txt) at the eastern end of the Sea of Marmara to facilitate road transportation between Istanbul and Izmir. As the main structure of the Gulf Crossing Project, the bridge is part of the Istanbul-Izmir Motorway and has reduced the sea crossing time to approximately 6 minutes. The total length of the [Osmangazi Bridge](/en/detay/osmangazi-koprusu-30692/llms.txt) is 2,682 meters, with a main span of 1,550 meters. As of its completion in 2016, this made it the seventh-longest suspension bridge in the world by main span length. The deck of the bridge is 35.93 meters wide and serves two-way traffic with six lanes. The deck height above sea level is 64 meters, allowing uninterrupted maritime navigation beneath the bridge. ![Image](https://cdn.kureansiklopedi.com/media/uploads/2025/05/26/QSPETTQnI1REhNUaAjSQalSEl6OaQrdK.jpg) *Osmangazi Bridge (AA)* ### **Structural System and Engineering Features** The towers of the bridge are 252 meters high and are anchored on pile foundations fixed to the seabed. The bridge is supported by a cable system, and the deck was lifted segment by segment and mounted onto the cables. Its wind resistance has been tested up to speeds of 216 km/h. Equipped with advanced monitoring and maintenance systems, the structure is constantly supervised. Given that it is located in a seismically active region, special engineering measures have been implemented. ### **Construction Process and Financing Model** The bridge was constructed under the Build-Operate-Transfer (BOT) model. The project was carried out without the use of public funds; the contractor committed to building and operating the bridge for a certain period before transferring it to the public sector. Construction began in 2013, and the bridge was officially opened by the Presidency on June 30, 2016. Engineers from Japan, South Korea, Italy, and Turkey took part in the construction of the Osmangazi Bridge. The design considered earthquake resistance, wind loads, and maritime traffic. The project incorporated seismic isolators, rigid structural elements, and advanced steel cable systems. With the completion of the bridge, heavy vehicle traffic was diverted away from city centers around the Gulf, increasing the efficiency of logistics networks. According to official sources, the bridge contributed approximately 650 million USD indirectly to the Turkish economy within the first five years following its opening. ### **Transportation and Time Savings** The reduction in travel time between Istanbul and Izmir has provided a significant advantage for both trade and tourism, particularly strengthening the logistical connections of industrial cities such as Bursa, Balıkesir, and Manisa. ![Image](https://cdn.kureansiklopedi.com/media/uploads/2025/05/22/bWDfFERvgDNsZEnbhS8FcDQae8876F2f.jpg) *Osmangazi Bridge (AA)* ### **Environmental Impact** Environmental Impact Assessment (EIA) studies were conducted for the project, with particular attention given to the marine ecosystem, water currents, and bird migration routes. Noise insulation measures were implemented for pile-driving machinery operating in the sea, and interventions to coastal ecosystems were kept to a minimum. ### **Sustainability and Maintenance System** The Osmangazi Bridge is equipped with a continuous Structural Health Monitoring System. Parameters such as wind, seismic activity, temperature, humidity, and traffic load are monitored in real time. This system is designed to ensure the safety and performance of the structure throughout its lifespan. Additionally, annual maintenance activities are carried out, including painting and tension checks of the cables. ## Academic Sources and References 1. Anadolu Ajansı. “Osmangazi Köprüsü'nün serüveni bu müzede anlatılıyor.” Accessed May 22, 2025. https://www.aa.com.tr/tr/turkiye/osmangazi-koprusunun-seruveni-bu-muzede-anlatiliyor/1475713Anadolu Ajansı. “Osmangazi Köprüsü bayram müjdesiyle hizmete açıldı.” Accessed May 22, 2025. https://www.aa.com.tr/tr/gunun-basliklari/osmangazi-koprusu-bayram-mujdesiyle-hizmete-acildi/600806General Directorate of Highways. “Gebze-Orhangazi-İzmir Otoyolu Projesi.” Accessed May 22, 2025. https://www.kgm.gov.tr/Sayfalar/KGM/SiteTr/Projeler/OtoyolProjeleri/GebzeOrhangazi.aspxPresidency of the Republic of Türkiye, Directorate of Communications. "Osmangazi Köprüsü 7 yaşında." Accessed May 22, 2025. https://www.iletisim.gov.tr/turkce/yerel\_basin/detay/osmangazi-koprusu-7-yasindaTRT Belgesel. "Türkiye’nin Dev Yapıları | Osmangazi Köprüsü". Yayın Tarihi: 2020. Accessed May 22, 2025. https://www.trtbelgesel.com.tr/bilim-teknoloji/turkiyenin-dev-yapilari/turkiyenin-dev-yapilari-or-osmangazi-koprusu-or-trt-belgesel-19464581