An archaeological evaluation was undertaken by Cotswold Archaeology in November and December 2008 at the request of MHJ Ltd on land adjacent to King’s Bridge, Yarnton, Oxfordshire. Nine trenches were excavated. The evaluation established that the site was covered with alluvial clays that sealed a natural sandy clay substrate. While the potential remained for pre-Roman archaeological features and deposits to be sealed by this alluvium, further excavation of the deposit beyond three trial holes was not possible due to the ingress of ground water. A series of earthworks that were previously interpreted as the remnants of ridge and furrow were found by the evaluation to be a series of post-medieval/modern open drains running east/west and north/south across the site.