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Around Llyn Trawsfynydd — Snowdonia National Park

Routes

Running trails & routes

Around Llyn Trawsfynydd — Snowdonia National Park

Moderate

125

runners

Around Llyn Trawsfynydd — Snowdonia National Park

01:27

12.9km

150m

Running

The Around Llyn Trawsfynydd trail in Snowdonia National Park offers a diverse jogging experience, combining varied terrain with rich scenery. You will encounter reservoir-side paths, dense forest trails, open moorland, and rolling hills, with the western side of the lake featuring the majority of the elevation gain. This moderate 8.0-mile…

Last updated: April 23, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc Cenedlaethol Eryri

Waypoints

Start point

Parking

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555 m

Trawsfynydd Nuclear Power Station

Highlight • Other

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 …

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2.62 km

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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7.75 km

Llyn Trawsfynydd Bridge

Highlight • Bridge

This footbridge was built to replace some of the lost footpaths that the lake flooded. The old track here linked Trawsfynydd village with the old chapel. It's a metal lattice …

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12.9 km

End point

Parking

Way Types & Surfaces

Way Types

3.60 km

3.47 km

3.08 km

2.76 km

Surfaces

4.34 km

3.89 km

2.29 km

1.67 km

705 m

Elevation

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

Highest point (290 m)

Lowest point (190 m)

Weather

Thursday 7 May

16°C

4°C

34 %

Additional weather tips

Max wind speed: 12.0 km/h

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This route was planned by komoot.

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Around Llyn Trawsfynydd — Snowdonia National Park

01:27h

12.9km

150m

Trail Reviews

Jessica Mather

June 20, 2025, Trawsfynydd Run 🏃🔥

Mix of road and trail. 30 degrees but a nice breeze. Stunning reservoir.

Around Llyn Trawsfynydd — Snowdonia National Park

Trawsfynydd Nuclear Power Station

Maentwrog Dam

Llyn Trawsfynydd Bridge

Nearby routes

Trail Reviews

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