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Maintenance was vital for the timber bridge. It was partly burnt in the revolt led by Bajamonte Tiepolo in 1310. It collapsed in 1444 under the weight of a crowd watching a boat parade and again in 1524.

During the 20th century, when many artesian wells were sunk into the periphery of the lagoon to draw water for local industry, Venice began to subside. It was realised that extraction of the aquifer was the cause. This sinking process has slowed markedly since artesian wells were banned in the 1960s. However, the city is still threatened by more frequent low-level floods (so-called Acqua alta, "high water") that creep to a height of several centimeters over its quays, regularly following certain tides. In many old houses the ground floor is unoccupied due to the periodic floods, but people continue to live and work in the upper stories.

The first dry crossing of the Grand Canal was a pontoon bridge built in 1181 by Nicolò Barattieri. It was called the Ponte della Moneta, presumably because of the mint that stood near its eastern entrance.

The Rialto Bridge (Italian: Ponte di Rialto) spans the Grand Canal in Venice. It is the oldest bridge across the canal and probably the most famous in the city.

By 1450, more than 3,000 Venetian merchant ships were in operation, and most of these could be converted when necessary into either warships or transports. The government required each merchant ship to carry a specified number of weapons (mostly crossbows and javelins) and armor; merchant passengers were also expected to be armed and to fight when necessary. A reserve of some 25 (later 100) war-galleys was maintained in the Arsenal. Galley slaves did not exist in medieval Venice, the oarsmen coming from the city itself or from its possessions, especially Dalmatia. Those from the city were chosen by lot from each parish, their families being supported by the remainder of the parish while the rowers were away. Debtors generally worked off their obligations rowing the galleys. Rowing skills were encouraged through races and regattas.

Venice became an imperial power following the Fourth Crusade, which (with Venetian aid) seized Constantinople in 1204 and established the Latin Empire. Considerable plunder was brought back to Venice, including the Winged Lion of St. Mark, symbol of Venice. Only Venetian ships could efficiently transport the men, supplies, and (especially) war horses.

By 1450, more than 3,000 Venetian merchant ships were in operation, and most of these could be converted when necessary into either warships or transports. The government required each merchant ship to carry a specified number of weapons (mostly crossbows and javelins) and armor; merchant passengers were also expected to be armed and to fight when necessary. A reserve of some 25 (later 100) war-galleys was maintained in the Arsenal. Galley slaves did not exist in medieval Venice, the oarsmen coming from the city itself or from its possessions, especially Dalmatia. Those from the city were chosen by lot from each parish, their families being supported by the remainder of the parish while the rowers were away. Debtors generally worked off their obligations rowing the galleys. Rowing skills were encouraged through races and regattas.

The Republic of Venice seized the eastern shores of the Adriatic before 1200, mostly for commercial reasons, because pirates based there were a menace to trade. The Doge already carried the titles Duke of Dalmatia and Duke of Istria. Later mainland possessions, which extended across Lake Garda as far west as the Adda River, were known as "Terrafirma", and were acquired partly as a buffer against beligerent neighbors, partly to guarantee Alpine trade routes, and partly to ensure the supply of mainland wheat, on which the city depended. In building its maritime commercial empire, the Republic acquired control of most of the islands in the Aegean, including Cyprus and Crete, and became a major power-broker in the Near East. By the standards of the time, Venice's stewardship of its mainland territories was relatively enlightened and the citizens of such towns as Bergamo, Brescia, and Verona rallied to the defence of Venetian sovereignty when it was threatened by invaders.

In the 12th century the essentials for the power of Venice were laid: the Arsenal was under construction in 1104; Venice wrested control of the Brenner pass from Veronia in 1178, opening a lifeline to silver from Germany; the last autocratic doge, Vitale Michiele, died in 1172.

The chief executive was the Doge (duke), who, theoretically, held his elective office for life. In practice, a number of Doges were forced by pressure from their oligarchical peers to resign the office and retire into monastic seclusion when they were felt to have been discredited by perceived political failure.

Six hundred years ago, Venetians protected themselves from land-based attacks by diverting all the major rivers flowing into the lagoon and thus preventing sediment from filling the area around the city. This created an ever-deeper lagoon environment.

The sestieri are the primary traditional divisions of Venice. The city is divided into the six districts of Cannaregio, San Polo, Dorsoduro (including the Giudecca), Santa Croce, San Marco and Castello (including San Pietro di Castello and Santa Elena).

Venice became part of the Austrian-held Kingdom of Lombardy-Venetia when Napoleon signed the Treaty of Campo Formio on October 12 1797. The Austrians took control of the city on January 18, 1798. It was taken from Austria by the Treaty of Pressburg in 1805 and became part of Napoleon's Kingdom of Italy, but was returned to Austria following Napoleon's defeat in 1814. In 1866, along with the rest of Venetia, Venice became part of Italy. After 1797, the city fell into a serious decline, with many of the old palaces and other buildings abandoned and falling into disrepair, although the Lido became a popular beach resort in the late 19th century.

Though Venice was famous for its navy, its army was equally effective. In the 13th century, most Italian city states already were hiring mercenaries, but Venetian troops were still recruited from the lagoon, plus feudal levies from Dalmatia and Istria. In times of emergency, all males between seventeen and sixty years were registered and their weapons were surveyed, with those called to actually fight being organized into companies of twelve. The register of 1338 estimated that 30,000 Venetian men were capable of bearing arms; many of these were skilled crossbowmen. As in other Italian cities, aristocrats and other wealthy men were cavalrymen while the city's conscripts fought as infantry.