Traders and residents are preparing for the worst with high Spring tides at 4.50am on Tuesday, again at 5.13pm, and on Wednesday at 5.34am.
A tidal surge and periodic strong southerly and south-easterly winds are also predicted over the next few days, resulting in higher tide levels.
City Hall took the decision to close Morrison’s Island, Union Quay, Father Mathew Quay, and Wandesford Quay from 7pm tonight.
Council officials and staff are taking the risk of flooding extremely seriously. Last week marked 10 years since a devastating river flood caused an estimated €90m worth of damage in the city centre.
Properties in low lying areas around Morrison’s Quay, Union Quay, Trinity Bridge, South Terrace, Lavitts Quay, Kyrls Quay and Wandesford Quay are on particularly high alert.
There is also a risk of flooding along South Mall via side streets onto Oliver Plunkett St and Patrick’s St, Grand Parade, Washington St, and Lower Glanmire Rd.
Oliver Plunkett St pharmacy owner John Minihan erected flood gates at his property in advance of the high tides.
“Besides preparing as best you can, there is not a whole lot that you can do and it’s hard to gauge how serious this will be,” he told The Echo.
“It’s unusual to see an alert issued that mentions almost all the streets in the core city centre and all the side streets as well.
“It just proves that we need a flood mitigation plan because it’s impossible to get flood cover and we are constantly under threat.
“We have a changing environment and we need to preserve our city centre as best we can and we need to protect traders.”