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United Kingdom
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Llanidloes Without

Clywedog Dam

Highlight • Lake

Clywedog Dam

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Hiking

by 13 explorers out of 14

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    Location: Llanidloes Without, Powys, Wales, United Kingdom

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    October 22, 2025

    Built primarily to regulate the flow of water in the River Severn, the Clywedog Dam is an impressive sight. It's the tallest concrete dam in Britain, at 236 feet (72 m) high, while it's also 750 feet (230 m) wide. There are two marked hiking trails on the reservoir.

    October 28, 2023

    Hiking

    Llyn Clywedog was the Tallest in the British Isle built purposely to control the level of water to help prevent any future flooding from the source of the River Seven. …

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    Routes here

    Best routes to Clywedog Dam

    4.1

    (8)

    65

    hikers

    1. Clywedog Dam – Yr Allt Summit Path loop from Y Fan

    5.21km

    01:35

    160m

    160m

    Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

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    Easy

    4

    hikers

    Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

    Easy

    Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

    Moderate

    Details

    Informations

    Elevation 310 m

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    Wednesday 4 February

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    1°C

    21 %

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    Max wind speed: 23.0 km/h

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    Location: Llanidloes Without, Powys, Wales, United Kingdom

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