A361 Sinkhole near Wardington

Work is due to start to repair a sinkhole on the A361 in north Oxfordshire.

The road, north of Wardington, was closed by Oxfordshire County Council on Monday after the sinkhole appeared in the centre of the carriageway. Emergency diversion routes were immediately put into place.

Following visits to the site by inspectors, the council’s contractors are planning to begin repair work today. It is hoped that the road can be opened and the repairs completed by the end of the month, depending on what is found once water is pumped out and excavation work starts.

Councillor Andrew Gant, Oxfordshire County Council’s Cabinet Member for Transport Management, said: “This is an extremely busy road, which is why we have made it a priority to have a repair programme in place within days.

“We will reopen the road as soon as it is safe to do so. We hope this will be by the end of December but, unfortunately, there are no guarantees when it comes to work of this nature. In the meantime, we would urge motorists to follow the diversion routes that are in place to ensure everyone’s safety.”

The suggested diversion route is between A423 Southam Road and the A425 Daventry Road.

It is believed that the sinkhole is a result of the recent flooding of the River Cherwell, causing washout of fill to affect a brick water pipe (culvert) running under the road. The most recent inspection of the culvert by the council’s highways teams, carried out before the flooding, showed no cause for concern in the culvert’s condition.

The washed out material has blocked the watercourse, submerging the culvert. The water will be pumped out to enable the culvert to be inspected, so that the full extent of required repairs can be determined.

The culvert may need to be temporarily replaced by a pipe to enable the sinkhole to be backfilled and the road reopened while a longer term repair is planned.

Cllr Gant added: “This is a pretty stark example of the kind of pressure our large and rural road network is experiencing from extreme weather. I am very grateful to our officers and contractors for getting out on site as soon as possible to put a plan in place for mitigation and repair.”