Blackfriars Road is likely to be closed for a further two weeks whilst Thames Water repairs a burst water main. The Cut and Union Street will be shut to through traffic for several weeks after that.
Blackfriars Road has already been shut for nearly two weeks since the road was flooded by a burst water main on Tuesday 21 January.
The SE1 website asked Thames Water for an update on repair work after contradictory reports were circulated by local politicians on Friday.
"Blackfriars Road is set to remain closed until around 13 February while we carry our more work on our pipe," a Thames Water spokeswoman said.
Cycleway 6 on Blackfriars Road remains open, with cyclists asked to dismount whilst passing the roadworks.
For the latest local news and events direct to your inbox every Monday, you need our weekly email newsletter SE1 Direct.
7,000+ locals read it every week. Can you afford to miss out?
Read the latest issue before signing up