(This small structure is not to be confused with the present-day Overtoun Bridge; see Link
for pictures of that much more substantial construction.)
The bridge shown here is on the course of a NS4275 : Former road to Overtoun House
(see that item for more on the road itself; in that photograph, the former road crosses this bridge in the foreground).
The old road led from Barnhill (NS4275 : Barnhill House
) to NS4276 : Overtoun House
, but fell into disuse before the 1890s. Also, as indicated on the first-edition OS map, the bridge carried the road across a burn. However, at present, the burn first emerges on the far side of the bridge; the intervening part of its course has been culverted since the late nineteenth century: see NS4275 : Burn disappearing under road
for the point where it disappears below ground, 200 metres ESE of here.
The bridge therefore now seems strangely out of place, standing alone in a field, and crossing a shallow valley where a burn used to flow. See NS4275 : Old bridge (detail)
for a closer view.
According to a Historic Scotland article about the Overtoun Estate, "a tree-lined approach to the house from the south came across the park and crossed the valley to the east of the NS4276 : Spardie Linn
by a small stone bridge. The bridge is still extant".
The bridge mentioned there is the one shown in my photograph. It is a relic of the Overtoun Estate as it was before John Campbell White (created Lord Overtoun in 1893) began his extensive programme of work on the estate in the 1890s.