is there any bridge built over it?
Ponte Milvio and the Ponte Sant'Angelo.
Tiber
In addition to the numerous modern bridges over the Tiber in Rome, there remain a few ancient bridges (now mostly pedestrian-only) that have survived in part (e.g., the Ponte Milvio and the Ponte Sant'Angelo) or in whole (Fabricius' Bridge).

what was the most powerful lawmaking body in the roman republic Assemblies how many types of assemblies are there? Curiate Assembly, the Centuriate Assembly, and the Tribal Assembly. what is the role of the extraordinary magistrates? The dictator of the extraordinary magistrates had "maius imperium" and total authority to command the state; however, since the dictator generally tried to maintain order, this did not conflict with the responsibilities of the other magistrates, who continued to function during a dictatorship. what is the function of the first assembly? It was ethnic in nature, and thus were organized on the basis of the early Roman family, or, more specifically, on the basis of the thirty original patrician (aristocratic) clans. who formed the roman constitution? It emerged from that of the Roman kingdom. what regions come under this kingdom? Tiber, Palatine Hill and hills surrounding it. what is the first mentioned one? The third-longest river in Italy. how did it get the name? The root is found in the Latin praenomen "Tiberius".
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Tiber [SEP] Bridges
In addition to the numerous modern bridges over the Tiber in Rome, there remain a few ancient bridges (now mostly pedestrian-only) that have survived in part (e.g., the Ponte Milvio and the Ponte Sant'Angelo) or in whole (Fabricius' Bridge). In addition to bridges, there are tunnels which the Metro trains use.