This appears to have been printed in reverse, and the S-shaped stone braces are differently-oriented. It is unlikely to be the west side of the bridge, which has bracing above both arches.
This is part of the Volume: AL0564 Buckinghamshire Bridges; within the Series: OWS01/01 The 'Blue Albums'; within the Collection: OWS01 Office of Works and Successors: Ancient Monuments and Historic Buildings
Copyright Crown copyright
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Creator of Archive: Office Of Works