In response to the letter 'Bridge baffler' (NCE 30 June), the Upton-upon-Severn viaduct was indeed constructed on the line of the original structure to avoid lengthy land procurement.
An assessment of costs, fl ood risk and implementation time resulted in the adoption of a short low level diversion route rather than a temporary bridge.
An agreement was negotiated with the adjacent caravan park landowner to permit an at grade, two way diversion without further obstructing the flood plain. There was enormous public support for the proposals which were then delivered to an extremely tight programme.
In severe flooding conditions, the route would have been impassable and a much wider diversion on existing roads brought into play. In the event the diversion remained open throughout construction.
John C Sreeves (M), senior bridge engineer, sreevesjc@halcrow. com