Wales: A centuries-old stone bridge buried beneath the waters of Wales’ Llwyn-Onn Reservoir has dramatically resurfaced as drought and plunging water levels expose the historic structure once again.
The 226-year-old Pont-ar-Daf stone bridge, believed to date to around 1800, has remained submerged since the construction of the reservoir in 1911. Historic records confirm that the two-arched bridge periodically reappears during severe drought conditions.
The extraordinary sight has turned the reservoir into an archaeological window into a lost landscape. The bridge once carried an old route across the River Taf Fawr, linking communities before the valley was flooded for the reservoir project.
The latest emergence comes amid a dramatic fall in Welsh reservoir levels. A recent report from July 2026 documented the historic bridge exposed at Llwyn-On Reservoir as drought conditions gripped Wales.
A bridge swallowed by water for more than a century has suddenly returned from the depths—offering a stunning reminder of the villages, roads and history buried beneath Wales’ reservoirs.
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