Llwyn-on reservoir, built in 1926, covers 150 acres and is the largest of the three in the Taff Fawr Valleys area. Walking along the shore you can be immersed in the fresh smells of the conifer forest and lapping sounds of the deep blue water - an ideal habitat for otters, great crested grebes, goldeneye, goosander and coot.

Adie

October 10, 2022

Cycling

Llwyn Onn reservoir offers views of conifer forest and the gentle lapping sounds of deep blue water.
It is the largest of the three reservoirs in the Taff Fawr Valleys area.

The fresh clean water provides an ideal habitat for otters, great crested grebes, goldeneye, goosander and coot.

If you're after refreshments, head to the Garwnant Visitor Centre. on the North shore.

David Howells

March 4, 2024

Hiking

A very pretty and accessible dam, the spillover makes it a lovely scenic addition to your loop of the reservoir or the nearby forest. There are lovely picnic areas on the way around the dam, some eating spots by way of a roadside 'scoff' van in a nearby lay-by on the eastern shore, and the cafe at Garwnant Visitor Centre on the north side of the reservoir.

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Best routes to Llwyn-on Reservoir Dam

4.3

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262

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1. Llwyn-on Reservoir loop

5.50km

01:26

40m

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

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Easy

4.3

(32)

258

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2. Llwyn-onn Reservoir loop — Bannau Brycheiniog (Brecon Beacons) National Park

5.43km

01:26

50m

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

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Easy

4.6

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3. Llwyn-on Reservoir – Llwyn-on Reservoir Dam loop from Llwyn-onn

9.55km

02:37

150m

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

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Moderate

Details

Informations

Elevation 250 m

Weather

Today

Wednesday 25 February

12°C

6°C

43 %

Additional weather tips

Max wind speed: 20.0 km/h

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Location: Hirwaun, Rhondda Cynon Taf, South Wales, Wales, United Kingdom

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Llwyn-on Reservoir Dam

1. Llwyn-on Reservoir loop

2. Llwyn-onn Reservoir loop — Bannau Brycheiniog (Brecon Beacons) National Park

3. Llwyn-on Reservoir – Llwyn-on Reservoir Dam loop from Llwyn-onn

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