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United Kingdom
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North Wales
Gwynedd

Llyn Trawsfynydd

Attractions and Places To See around Llyn Trawsfynydd - Top 3

Best attractions and places to see around Llyn Trawsfynydd include a diverse range of natural and historical sites within Snowdonia National Park. Llyn Trawsfynydd is a large man-made reservoir, originally constructed for hydroelectric power and later used for cooling a nuclear power station. The area features well-maintained cycleways and footpaths, offering opportunities to explore woodlands, nature reserves, and wetlands. It combines significant industrial heritage with natural landscapes.

Best attractions and places to see around Llyn Trawsfynydd

  • The most popular attractions…

Last updated: May 9, 2026

Llyn Trawsfynydd

Highlight • Structure

An enormous man-made reservoir, Llyn Trawsfynydd originally provided cooling water for the local nuclear power station (now undergoing decommissioning). The lake lies in the west of Snowdonia National Park and …

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Trawsfynydd Nuclear Power Station

Highlight • Monument

Here you can learn that the nuclear power plant is no longer in operation, serves as a (temporary) storage facility and should be dismantled by the end of the century.

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Maentwrog Dam

Highlight • Lake

Maentwrog Dam was built in the 1920s to provide a source of hydroelectric power for the Maentwrog power station. Later in 1965 the lake also became a source of cooling water for the Trawsyfynydd nuclear power station.

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A bit muddy after rain but never too bad. Avoids the main road, well signposted.

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Popular around Llyn Trawsfynydd

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Cycling around Llyn Trawsfynydd

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Tips from the Community

Phil Lucock
August 3, 2025, Singletrack Trail in Parc Cenedlaethol Eryri

perfect after a ride from Machynlleth "Canolfan Prysor Centre" with all the usual cafe favourites, good food and friendly staff.

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51m
December 13, 2022, Maentwrog Dam

Maentwrog Dam was built in the 1920s to provide a source of hydroelectric power. Later in 1965 the lake also became a source of cooling water for the nuclear power station.

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51m
December 7, 2022, Maentwrog Dam

Maentwrog Dam was built in the 1920s to provide a source of hydroelectric power for the Maentwrog power station. Later in 1965 the lake also became a source of cooling water for the Trawsyfynydd nuclear power station.

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Trawsfynydd nuclear power station was the only inland nuclear power plant in the UK. It was able to be situated here because of the large lake that provided sufficient cooling water to the reactors. The power station switched on in 1965 and closed at the end of its safe life in 1991. The planned decommissioning was expected to take about 100 years but in 2021 the Welsh government started to explore plans to install a smaller reactor and reinstate the power station to help Wales reach zero carbon electricity production.

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Lovely well signposted singletrack. It avoids riding on the busy neighbouring road but can be muddy after rainfall.

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ionapawson
October 12, 2022, Maentwrog Dam

Dam that is easy to ride over, and the last paved section when riding around the lake anti-clockwise.

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scaurum
June 19, 2022, Maentwrog Dam

Built in 1992 to generate electricity after the nearby nuclear power plant was shut down.

Translated by Google

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Here you can learn that the nuclear power plant is no longer in operation, serves as a (temporary) storage facility and should be dismantled by the end of the century.

Translated by Google

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Frequently Asked Questions

What natural features can I explore around Llyn Trawsfynydd?

Llyn Trawsfynydd itself is a vast man-made reservoir, covering 1,200 acres within Snowdonia National Park. It is surrounded by woodlands, nature reserves, and wetlands, supporting diverse animal and birdlife. You can explore its shores via well-maintained cycleways and footpaths. The lake is overlooked by mountains like the Rhinogs and Cadair Idris, offering scenic views. The Llyn Trawsfynydd highlight provides more details on the lake's beauty and trails.

What historical sites are there to visit near Llyn Trawsfynydd?

The area boasts significant historical sites. You can visit Maentwrog Dam, built in the 1920s for hydroelectric power. Further afield, Tomen-y-Mur Roman Fort features extensive Roman remains, including an amphitheater and bathhouse. Another poignant site is Yr Ysgwrn, the conserved farmhouse of the renowned Welsh poet Hedd Wyn, offering insight into early 20th-century Welsh rural life.

What cycling opportunities are available around Llyn Trawsfynydd?

Llyn Trawsfynydd offers excellent cycling opportunities. A new cycle loop encircles the lake, and well-maintained cycleways and footpaths are available, including a section of National Cycle Route 82. For more extensive rides, you can explore various cycling routes listed in the Cycling around Llyn Trawsfynydd guide, ranging from moderate to difficult.

Are there walking or hiking trails suitable for different abilities?

Yes, there are numerous walking and hiking trails. Footpaths encircle Llyn Trawsfynydd, offering easy strolls with scenic views. For more challenging options, the Hiking around Llyn Trawsfynydd guide lists routes like the 'Northern Rhinogs Loop' (moderate) and the 'Cambrian Way: Rhinogs Section' (difficult), catering to various fitness levels.

Can I go fishing or enjoy other watersports on Llyn Trawsfynydd?

Llyn Trawsfynydd is well-known for its fishing, with populations of wild brown trout, stocked rainbow trout, perch, rudd, and pike. Fishing boats are available for hire. The lake is also a popular spot for other watersports such as canoeing and kayaking, and it's a great location for birdwatching, with diverse waterfowl and occasional osprey sightings.

Is Llyn Trawsfynydd suitable for families with children?

Absolutely. The well-maintained cycleways and footpaths around Llyn Trawsfynydd are suitable for family walks and cycling. Many highlights, including the lake itself and Maentwrog Dam, are categorized as family-friendly. The natural surroundings offer opportunities for birdwatching and enjoying the outdoors together.

Are there specific routes for mountain biking near Llyn Trawsfynydd?

Yes, mountain biking enthusiasts will find several routes. The MTB Trails around Llyn Trawsfynydd guide features routes like the 'Llyn Trawsfyndd loop' and 'The Foundry Skills Area – Tarw Du Trail Entrance loop,' offering moderate challenges for mountain bikers.

What is the best time of year to visit Llyn Trawsfynydd for outdoor activities?

The spring and summer months (April to September) generally offer the most pleasant weather for outdoor activities like cycling, walking, and watersports around Llyn Trawsfynydd. Autumn also provides beautiful scenery with changing foliage. While accessible year-round, winter can bring colder, wetter conditions, though the landscape remains dramatic.

How long does it take to walk or cycle around Llyn Trawsfynydd?

The full loop around Llyn Trawsfynydd is approximately 14-17 km (8.7-10.5 miles). Walking this distance can take 3-5 hours depending on pace and stops. Cycling the loop is typically quicker, taking 1-2 hours. Shorter sections and alternative routes are also available if you prefer a less strenuous outing.

Can I visit the former Trawsfynydd Nuclear Power Station?

The Trawsfynydd Nuclear Power Station is no longer operational and is currently undergoing decommissioning. While it was once the UK's only inland nuclear power station and had a visitor center, public access to the main site is restricted due to the ongoing decommissioning process. It remains a prominent landmark in the area.

Are there any accessible trails or facilities for visitors with mobility needs?

While specific wheelchair-accessible trails are not explicitly detailed for the entire loop, the well-maintained cycleways and footpaths around Llyn Trawsfynydd offer relatively flat sections that may be suitable for some visitors with mobility needs. It is advisable to check local information or contact visitor centers for the most up-to-date accessibility details on specific sections.

What do visitors particularly enjoy about Llyn Trawsfynydd?

Visitors frequently highlight the exceptional beauty of Llyn Trawsfynydd, despite its industrial past. The stunning views of the lake and surrounding mountains, the peaceful atmosphere, and the well-maintained trails for cycling and walking are often praised. The diverse animal and birdlife, including occasional osprey sightings, also contribute to a rewarding experience.

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