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Hiking trails & Routes

Llanidloes Without

Clywedog Dam – Clywedog Reservoir loop from Pen-Y-Gaer

Hiking trails & Routes

Llanidloes Without

Clywedog Dam – Clywedog Reservoir loop from Pen-Y-Gaer

Moderate

5

hikers

Clywedog Dam – Clywedog Reservoir loop from Pen-Y-Gaer

02:54

9.76km

290m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: August 27, 2026

Waypoints

A

Start point

Parking

1

46 m

Clywedog Dam

Highlight • Lake

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.

Tip by

2

1.49 km

Picnic Table With View of River Valley

Highlight • River

Great hike but lots of fallen trees so made it much harder and longer

Tip by

3

1.66 km

Yr Allt Summit Path

Highlight • Summit

4

5.80 km

Clywedog Reservoir

Highlight • Lake

Llyn Clywedog is a reservoir created by the construction of the Clywedog Dam. As well as regulating the flow of the River Severn, the reservoir also provides drinking water to the West Midlands. The llyn is a great place to spot some impressive bird species. Red kites and buzzards are common here, while ospreys have occasionally been sighted.

Tip by

B

9.76 km

End point

Parking

Way Types & Surfaces

Way Types

3.91 km

3.08 km

2.23 km

511 m

< 100 m

Surfaces

6.02 km

3.08 km

551 m

< 100 m

< 100 m

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Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (400 m)

Lowest point (290 m)

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Weather

Powered by Foreca

Monday 5 October

18°C

12°C

38 %

Additional weather tips

Max wind speed: 4.0 km/h

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