There is a handy web page here where you can report emerging potholes.

Report a pothole online

• Potholes reported to www.oxfordshire.gov.uk/report  will automatically be logged for the attention of highways officers – helping to speed up the process of identifying, mapping and prioritising defects.
• In particular, people who upload photos will provide insight to the severity of the defect, reducing the need for further on-site investigation. The site also features an interactive map which allows users to check whether the pothole they are reporting has already been logged, avoiding duplication.
• Encouraging online reporting will help reduce the volume of calls to the council’s customer service centre (CSC) and free up staff to deal with other pressing enquiries. Residents will of course still be able to report road defects by calling 0845 310 1111
• Once a reported pothole has been verified by a member of the Highways team, the county council’s contractor undertakes to repair these potholes within 28 days, 24 hours for emergency potholes, and two hours for the most severe category.