One lane of the A303 eastbound between the A36 near Deptford and the A360 near Stonehenge is now open following significant flooding.
A contraflow has been set up on the westbound carriageway to allow the eastbound route to reopen. This means that one lane is in operation in both directions.
Slip roads to and from the A36 from the eastbound carriageway of the A303 will remained closed and road users wishing to access the A36 should leave the A303 at the Longbarrow junction and join the A360 southbound to rejoin the A36 at Salisbury.
The contraflow has required the removal of an 80 metre section of the central reservation barrier.
Approximately 500 sand bags have been taken to the site in case they are needed to protect the carriageway in the event of increased water levels on the eastbound carriageway.
Groundwater levels are continuing to rise with residents along the river Avon in Wiltshire, the Stour in Dorset and the Meon in Hampshire warned about the risk of more flooding this weekend.
16 Flood Warnings remain in place across our region tonight. River levels also remain high along the Arun in Pulborough, flooding nearby fields.
In the New Forest, firefighters transported bales of hay to around 30 cows who became stranded by flood water.
Meanwhile, up to a million pounds is being spent repairing railways on the Isle of Wight. Islanders have been without any train services for almost three weeks because of floods and landslides. Today, work continued to repair the tracks - as Dave Russell reports.
Flood warnings have been issued by the Environment Agency in several locations across West Berkshire. Road closures have been put in place by the Council and a map of where those closures are is here.
As in previous years, some of the affected properties are in Purley. The Council's Emergency Operations Centre has been set up to co-ordinate activity and all relevant services are working to ensure that those affected are receiving help and support.
Drains and gulleys are being cleared of debris. 'The Barn' at Purley is on standby as a possible rest centre should residents need to evacuate homes. Residents currently experiencing flooding in Purley are in Riverside Gardens, Winteringham Way, Chestnut Grove and Colyton Way.
Canoes have replaced cars in one part of the south as water levels continue to rise cutting off communities.
People in Purley in Berkshire have seen their streets submerged and homes affected by flooding.
There are still warnings in place for the River Thames which is expected to have reached its peak this lunchtime.
Thirty stranded cows, surrounded by flood water in their field, have had to be fed by Hampshire Fire and Rescue.
Fire crews were made aware of the cows in Fordingbridge, and along with the RSPCA a joint operation began to try and help them.
It was decided that the cows were safe but were unable to feed, so the team took 18 bales of hay to them, via a boat.
Animal Rescue specialist Jim Green said, "Due to the nature of the incident, it was impossible to move 30 cows.
"It is hoped that the hay will give them enough food until the water levels drop.
"The cows were stranded after the River Avon flooded the Water Meadow near Fordingbridge, cutting off most of its 70-acre field."
Amazing footage showing the extent of the flooding in Pulborough, West Sussex. Courtesy of @ Ark Drone Werks.
Animal rescue specialists and the RSPCA have taken bales of hay to cows stranded near Fordingbridge due to floods. http://t.co/zOA8R3wm60
A major operation is underway tonight to pump away the flood water that's causing rush-hour gridlock in Oxford. It's also hit rail services from Hampshire and Berkshire to the north.
At one point all rail services were suspended through the city. Pumps are working to clear water from Abingdon Road and Botley Road.
The Thames Valley has 45 flood warnings in place across the region - most of them centred along the River Thames from the West of Oxford through Reading to Windsor.
Already water is surging downstream flooding towns and villages like Purley on Thames.
Cary Johnston reports.