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Running trails & routes

Maentwrog Dam – View of Llyn Trawsfynydd loop from Maentwrog

Running trails & routes

Maentwrog Dam – View of Llyn Trawsfynydd loop from Maentwrog

Moderate

10

runners

Maentwrog Dam – View of Llyn Trawsfynydd loop from Maentwrog

01:02

9.64km

150m

Running

Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: May 10, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Ceunant Llennyrch National Nature Reserve

Parc Cenedlaethol Eryri

Waypoints

A

Start point

Parking

Get Directions

1

341 m

Llyn Trawsfynydd Visitor Centre

Highlight • Cafe

Cafe/restaurant and fishing centre at the lake. Open Thurs-Sun 8-2:30

Tip by

2

727 m

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.

Translated by Google •

Tip by

3

954 m

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 …

Tip by

4

2.97 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.

Tip by

5

4.87 km

View of Llyn Trawsfynydd

Highlight • Lake

Surprisingly steep uphill to here, but good views and the high point of the circuit around the Llyn.

Tip by

6

8.95 km

View of Llyn Trawsfynydd

Highlight • Viewpoint

Beautiful views across the lake and the mountains beyond. Originally a reservoir built for the nuclear power station nearby.

Tip by

B

9.64 km

End point

Parking

Way Types & Surfaces

Way Types

4.73 km

3.99 km

371 m

299 m

184 m

Surfaces

4.84 km

3.88 km

359 m

184 m

139 m

< 100 m

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Elevation

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)

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Weather

Powered by Foreca

Monday 10 August

26°C

7°C

0 %

Additional weather tips

Max wind speed: 10.0 km/h

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