The A555 Manchester Airport Relief Road has reopened after being closed due to flooding for the last six days.
It's the third time in just six months the £290m bypass, which opened last October, has been under water.
Engineers are still working to pump out remaining water and a 40mph speed limit is in place, but drivers are now able to use the road again.
In a statement Stockport council said: "The westbound section of the A555 from the Oil Terminal at Bramhall to the A34 junction at Handforth Dean has been reopened this evening, Monday.
"A lane closure and a 40mph speed limit will be in place so our engineers can continue to access the pumping stations on that stretch.
"The section of the westbound A555 from the A34 at Handforth to Styal Road, maintained by Cheshire East Council, is passable by driving up and down the slip road.
"Highways officers from Cheshire East Council are continuing to remove the flood water in the underpass at this location. Works will continue for the next few days fitting the new pumps."
Engineers were in the process of replacing pumps which had failed when the road flooded for the first time in March when it was submerged again on Sunday, July 28.
It had only been reopened for a few hours when flooding hit for a third time last Wednesday.
Speaking last week a spokeswoman for Stockport council said there would be a 'full and thorough' investigation once the waters had been cleared.
She added the planned replacement of the pumping station would also recommence at that point.
Coun Brian Bagnall called for the investigation to be carried out 'swiftly'.
He said: "The council officers have done a really good job in in very difficult circumstances.
"I do not think anybody anticipated that amount of rain would fall in such a short space of time.
"I think there was a set of new pumps due to be installed last Wednesday but events overtook that.
"I understand it's frustrating for residents, but now we need to understand exactly what the issues are and what the engineering solutions are to prevent it happening again.
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"This needs to be done as swiftly as possible to rebuild the confidence of residents.
"I'm no expert but it seems to me that this can't be just a like-for-like replacement of the pumps - we need to overcompensate to stop it happening again."
