Thornborough Bridge is situated on the original Bletchley to Buckingham road, now bypassed by a modern bridge in 1974 for the A421. The bridge is accessible to pedestrians from an adjacent lay-by.
The bridge straddles the parish boundaries of Thornborough and Buckingham, where the parish boundary follows the line of Padbury Brook (also known as The Twins), a tributary of the River Great Ouse. Dating back to the end of the 14th century,AVDC information board on-site "dates to 1400" it is the only surviving mediaeval bridge in Buckinghamshire. The parish division is marked by a boundary stone in the middle of the bridge.
The stone bridge measures approximately long and wide, spanning the river with six low arches. Three refuges are formed within the parapet on the south side.
The bridge is Grade I listed by English Heritage.
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