Geoarchaeological monitoring of GI works, comprising the recording of a total of six dynamic sample and seven overwater vibrocore boreholes, followed by a programme of deposit modelling, was undertaken in advance of proposed refurbishment of the A47 Great Ouse Bridge, King's Lynn, Norfolk. The geoarchaeological monitoring was undertaken in order to provide information on the archaeological and geoarchaeological resource that might be impacted by the proposed development, and to inform the scope and requirement for any further archaeological and geoarchaeological investigations that may be required. The sequence of superficial geological deposits at the Site comprises a basal fluvial sand and gravel, overlain by a sequence of freshwater and estuarine alluvium forming under the influence of relative sea level rise during the Holocene to a level of c. 5 m OD. The contemporary River Great Ouse cuts through this alluvial sequence to a river bed level of c. -3 m OD, where modern river bed sediments are recorded overlying a similar sequence of Holocene estuarine alluvium and fluvial sands and gravels.