Serbian: Трајанов мост
Romanian: Podul lui Traian
|Locale||East of the Iron Gates, near the cities of Drobeta-Turnu Severin (Romania) and Kladovo (Serbia)|
|Architect||Apollodorus of Damascus|
|Material||Wood and Stone|
|Total length||1,135 m (3,724 ft)|
|Width||15 m (49 ft)|
|Height||19 m (62 ft)|
|Number of spans||20 masonry pillars|
|Heritage status||Monuments of Culture of Exceptional Importance, and Archaeological Sites of Exceptional Importance, Serbia|
|Collapsed||Superstructure destroyed by Hadrian|
Trajan's Bridge (Romanian: Podul lui Traian; Serbian: Трајанов мост, Trajanov Most) or Bridge of Apollodorus over the Danube was a Roman segmental arch bridge, the first to be built over the lower Danube. Though it was only functional for a few decades, for more than 1,000 years it was the longest arch bridge in both total and span length.
The bridge was situated East of the Iron Gates, near the cities of Drobeta-Turnu Severin (Romania) and Kladovo (Serbia). Its construction was ordered by Emperor Trajan as a supply route for the Roman legions fighting in Dacia.
The structure was 1,135 m (3,724 ft) long (the Danube is 800 m (2,600 ft) wide in that area), 15 m (49 ft) wide, and 19 m (62 ft) high (measured from the river's surface). At each end was a Roman castrum, each built around an entrance (crossing was possible only by walking through the camp).
Its engineer, Apollodorus of Damascus, used wooden arches, each spanning 38 m (125 ft), that were set on twenty masonry pillars (made of bricks, mortar and pozzolana cement). It was built unusually quickly (between 103 and 105), employing the construction of a wooden caisson for each pier.
Tabula Traiana 
A Roman memorial plaque ("Tabula Traiana"), 4 meters wide and 1.75 metres high, commemorating the completion of Trajan's military road is located on the Serbian side facing Romania near Ogradina. In 1972, when the Iron Gate I Hydroelectric Power Station was built, the plaque was moved from its original location, and lifted to the present place. It reads:
- IMP. CAESAR. DIVI. NERVAE. F
NERVA TRAIANVS. AVG. GERM
PONTIF MAXIMUS TRIB POT IIII
PATER PATRIAE COS III
MONTIBVUS EXCISI(s) ANCO(ni)BVS
SVBLAT(i)S VIA(m) F(ecit)
The text was interpreted by Otto Benndorf to mean:
- Emperor Caesar son of the divine Nerva, Nerva Trajan, the Augustus, Germanicus, Pontifex Maximus, invested for the fourth time as Tribune, Father of the Fatherland, Consul for the third time, excavating mountain rocks and using wood beams has made this road.
Destruction/erosion and remains 
The twenty pillars were still visible in 1856, when the level of the Danube hit a record low.
In 1906, the International Commission of the Danube decided to destroy two of the pillars that were obstructing navigation.
In 1932, there were 16 pillars remaining underwater, but in 1982 only 12 were mapped by archaeologists; the other four had probably been swept away by water. Only the entrance pillars are now visible on either bank of the Danube.
In 1979, Trajan's Bridge was added to the Monument of Culture of Exceptional Importance, and in 1983 on Archaeological Sites of Exceptional Importance list, and by that it is protected by Republic of Serbia.
See also 
- The bridge seems to have been surpassed in length by another Roman bridge across the Danube, Constantine's Bridge, a little-known structure whose length is given at 2,437 m (Tudor 1974b, p. 139; Galliazzo 1994, p. 319).
- The earliest identified Roman caisson construction was at Cosa, a small Roman colony north of Rome, where similar caissons formed a breakwater as early as 2nd century BC: International Handbook of Underwater Archaeology, 2002.
- Troyano, Leonardo Fernández, "Bridge Engineering - A Global Perspective", Thomas Telford Publishing, 2003
- In the first century BC, Roman engineers had employed wooden caissons in constructing the Herodian harbour at Caesarea Maritima: Carol V. Ruppe, Jane F. Barstad, eds. International Handbook of Underwater Archaeology, 2002, "Caesarea" pp505f.
- Opper, Thorsten (2008). Hadrian: Empire and Conflict. Harvard University Press. p. 67. ISBN 9780674030954.
- Romans Rise from the Waters
Further reading 
- Bancila, Radu; Teodorescu, Dragos (1998), "Die römischen Brücken am unteren Lauf der Donau", in Zilch, K.; Albrecht, G.; Swaczyna, A. et al., Entwurf, Bau und Unterhaltung von Brücken im Donauraum, 3. Internationale Donaubrückenkonferenz, 29–30 October, Regensburg, pp. 401–409
- Galliazzo, Vittorio (1994), I ponti romani. Catalogo generale, Vol. 2, Treviso: Edizioni Canova, pp. 320–324 (No. 646), ISBN 88-85066-66-6
- Griggs, Francis E. (2007), "Trajan's Bridge: The World's First Long-Span Wooden Bridge", Civil Engineering Practice 22 (1): 19–50, ISSN 0886-9685
- Gušić, Sima (1996), "Traian's Bridge. A Contribution towards its Reconstruction", in Petrović, Petar, Roman Limes on the Middle and Lower Danube, Cahiers des Portes de Fer 2, Belgrade, pp. 259–261
- O’Connor, Colin (1993), Roman Bridges, Cambridge University Press, pp. 142–145 (No. T13), 171, ISBN 0-521-39326-4
- Serban, Marko (2009), "Trajan’s Bridge over the Danube", The International Journal of Nautical Archaeology 38 (2): 331–342, doi:10.1111/j.1095-9270.2008.00216.x
- Tudor, D. (1974a), "Le pont de Trajan à Drobeta-Turnu Severin", Les ponts romains du Bas-Danube, Bibliotheca Historica Romaniae Études 51, Bucharest: Editura Academiei Republicii Socialiste România, pp. 47–134
- Tudor, D. (1974b), "Le pont de Constantin le Grand à Celei", Les ponts romains du Bas-Danube, Bibliotheca Historica Romaniae Études 51, Bucharest: Editura Academiei Republicii Socialiste România, pp. 135–166
- Ulrich, Roger B. (2007), Roman Woodworking, Yale University Press, pp. 104–107, ISBN 0-300-10341-7
- Vučković, Dejan; Mihajlović, Dragan; Karović, Gordana (2007), "Trajan's Bridge on the Danube. The Current Results of Underwater Archaeological Research", Istros (14): 119–130
|Wikimedia Commons has media related to: Trajan's Bridge|
For more information, visit the official site of Trajan's Bridge
- Bridge of Apollodorus over the Danube at Structurae
- Romans Rise from the Waters – Excavations
- Traianus – Technical investigation of Roman public works
- Institute for the Protection of Cultural Monuments of Serbia
- Trajan's bridge near Kladovo (Serbian)
- Gallery 2003
- Gallery 2005