The Garreg-ddu dam in the Elan Valley of mid-Wales is an unusual one, hidden below the waterline of the reservoir. A row of stone arches carries the road across the water on the Garreg-ddu viaduct, and beneath the surface a submerged dam holds the level up so that water can feed by gravity into the ...
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Parking nearby
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Food Spots nearby
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Staycations nearby
Parking:
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Staycations:
2 day, 8 overnight
FAQ's/Things to Know
Where is Garreg Ddu Dam?
Mid Wales hosts this impressive structure within the rolling green hills of the Elan Valley. Hikers easily spot the masonry pillars while exploring the surrounding reservoir network.
What type of place is Garreg Ddu Dam?
Garreg Ddu Dam is a submerged reservoir wall topped by a stone road bridge in Mid Wales.
When is the best time to visit Garreg Ddu Dam?
Any season offers fine scenery, but a dry summer allows you to catch a rare glimpse of the submerged masonry wall. Winter also provides a dramatic atmosphere when heavy rainfall makes the surrounding water levels swell.
What can you do at Garreg Ddu Dam?
Walking across the stone bridge offers a fantastic vantage point to peer down into the deep, dark water. Photography enthusiasts enjoy capturing the way the ancient columns cut through the glassy lake surface, while wildlife watchers frequently spot red kites circling overhead.
How long should I spend at Garreg Ddu Dam?
Allocating roughly an hour provides ample time to stroll along the parapet and take a few good photographs. A longer stay suits anyone wanting to tackle the longer circular walking tracks around the wider valley floor.
Where do I park at Garreg Ddu Dam?
Space is available for ten vehicles nearby, offering two daytime slots and eight spots for overnight stays. Full details are available on the UK Hidden Gems app.
Where can I eat near Garreg Ddu Dam?
There are no food spots recorded immediately near Garreg Ddu Dam, check the UK Hidden Gems app for the nearest options.
Where can I stay near Garreg Ddu Dam?
There are no staycation spots recorded immediately near Garreg Ddu Dam, check the UK Hidden Gems app for the nearest options.
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Last Updated:
02 July 2026



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