Police are advising motorists to avoid the A127, particularly at the Rayleigh Weir, which remains flooded after Saturday's heavy rain.
Officers are working with the local authority to get the water pumped away and reopen the road as soon as possible.
Over 200 incidents of flooding were reported to police on Saturday with areas worst affected including Southend, Canvey, Maldon, Burnham, Battlesbridge and Benfleet.
More top news
A week after a woman was raped in Lowestoft, police were out in the early hours of the morning speaking to people in the area.
A union says it will "seek clarity" on the future of Colman's Mustard in Norwich - after Britvic confirmed it was leaving the city.
Britvic has confirmed it is to close its factory in Norwich, leading to the loss of more than 200 jobs.