It is important to note that the bridges mentioned in the question are not maintained by the Department for Transport. Clifton Suspension Bridge is run by Clifton Suspension Bridge Trust, the Tyne Bridge is run by Newcastle City Council and the Severn Bridge is run on a concession by River Crossing PLC. However, I have been informed that the Tyne Bridge spent £58.016 million and the Severn Crossing spent £64.31 million on maintenance in the last 5 financial years. The department has not been given details for Clifton at this current time.