Road closures around Norman Street are being put in place after a water main pipe burst in Lincoln before 8am on Monday, July 1.
Anglian Water are on scene dealing with the issue, while the road is partially flooded and the Thornbridge car park is also closed.
A part of road has been closed to motorists due the burst causing tarmac to dislodge and push up.
Lincoln Bus station is operating at usual, but buses will be using the main entrance as an exit too.
Those already parked in Thornbridge are being diverted down the entrance ramp.
Anglian Water were informed of the leak at 8.30am.
The issue is being given priority status, and is expected to be fixed by late afternoon.
Update on July 1 @ 15.41pm: Antony Innes, from Anglian Water, said: “We are sorry for any disruption caused after a water main burst in Norman Street, Lincoln, this morning.
“Engineers were quickly on site, shortly after the problem was reported around 8:30am, to stem the flow from the leak and set about repairing the pipe.
“We initially hoped to have everything back to normal by late afternoon; however several layers of reinforced concrete and nearby electricity cables have made the repair far more complicated than first thought.
“Unfortunately, the location of the leak meant part of the road had to be closed. Buses exiting the bus station had to go back out of the entrance and the Thornbridge car park was also closed. These will continue to be affected until the repairs are finished.
“Our team are working hard to complete the work, restore supplies to the five affected businesses and get things back to normal as quickly as possible.
“Once again we are sorry for the impact this repair is having and are grateful for the patience and understanding of the council, bus company and customers affected.”