The River Seine has swollen following days of heavy rain.
Days of torrential rain have caused the River Seine to rise above 17 feet. Peak flooding is expected in the night from Friday to Saturday.
Those living by the river have boarded up windows, with some fearful of losing all their possessions as they did in the 2016 floods.
It comes after the River Seine reached more than 18ft on Thursday evening at the Austerlitz bridge in the east of the city and burst its banks.
Water levels had risen to nearly 17 feet as of Wednesday - more than double the average, according to ABC news.
The river is expected to reach a peak of up to 6.2 metres in the capital today, which is four to five metres above its normal height.
Some quay-side restaurants were submerged, and some roads and parks were closed as a precautionary measure - along with the bottom floor of the Louvre Museum.
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All Metro stations are now open although services have been affected by the floods especially on line 7 where water has got on to the tracks.
But this week, the French capital looks more like a city of water.
A main commuter line, the RER C, has halted service at Paris stops through Wednesday, and some expressways that run alongside the Seine have been closed.
By midday Friday, the Zouave had water up to its thighs. "They put everything up on concrete blocks".
Homes are flooded, cars are underwater and Parisians are traveling down water-logged suburban streets by boat.
"Beyond the emergency, this flooding phenomenon, which is more and more recurrent in Paris, reminds us how important it is for our city to adapt to climate change", she said in a tweet. According to projections, a flood comparable to the 1910 Great Flood could cost damage costing between 3 billion euros ($3.7 billion) and 30 billion euros ($37 billion).