The River Seine in the French capital, Paris, has peaked at around four meters above its normal water level for this time of year.
The flood level rose to 5.84m (19.2ft) early on Monday and is not expected to begin receding before Tuesday.
Several stations of a main commuter line, the RER C, have now been closed until at least 5 February, and some expressways that run alongside the Seine have also been closed.
The city’s famous Bateaux Mouches tourist boats are out of service, with only emergency services allowed to use the river.