Lake Vyrnwy and Dam – Bwlch y Groes Pass loop from Afon Eiddew

Bike touring routes & trails

Lake Vyrnwy and Dam – Bwlch y Groes Pass loop from Afon Eiddew

Hard

5.0

(1)

riders

Lake Vyrnwy and Dam – Bwlch y Groes Pass loop from Afon Eiddew

03:29

50.0km

840m

Cycling

Hard bike ride. Very good fitness required. You may need to push your bike for some segments of this route. The starting point of the route is right next to a parking lot.

Last updated: July 31, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc Cenedlaethol Eryri

Y Berwyn National Nature Reserve

Waypoints

Start point

Parking

Get Directions

8.10 km

Lake Vyrnwy Straining Tower

Highlight • Monument

Lake Vyrnwy (Welsh: Llyn Efyrnwy, pronounced [ɛˈvərnʊɨ] or Llyn Llanwddyn) is a reservoir in Powys, Wales, built in the 1880s for Liverpool Corporation Waterworks to supply Liverpool with fresh water. …

Translated by Google •

Tip by

9.70 km

Lake Vyrnwy and Dam

Highlight • Bridge

Park at the very top of the Lake if arriving in a car. Note that some sections can get closed due to rock falls at the top of the Lake near the Waterfall Car Park.

Tip by

16.9 km

View of Lake Vyrnwy

Highlight • Lake

Peaceful hidden beach where the river Eunant joins Llyn Llanwddyn at the north-west corner of the lake.

Tip by

21.2 km

Bwlch y Groes Pass

Highlight • Mountain Pass

Whether on a road bike or touring, this mountain pass is not to be missed, smooth surfaces, little traffic, ups and downs all the way... watch out for the sheep..

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22.6 km

View of the Valley at the Wooden Cross

Highlight • Viewpoint

23.3 km

Bwlch y Groes

Mountain Pass

23.8 km

Bwlch y Groes (Hellfire Pass)

Highlight (Segment) • Mountain Pass

Tough road climb, not for the faint hearted! The official top 100 climbs finishes just left of the fork or turn right and descend to the lake.

Tip by

38.1 km

Lake Vyrnwy Picnic Area

Highlight • Lake

Beautiful spot on Lake Vyrnwy with picnic tables and benches.

Tip by

40.4 km

Lake Vyrnwy and Water Tower

Highlight (Segment) • Cycleway

Lake Vyrnwy is considered to be Wales’ most beautiful lake. To cycle around its steeply wooded shoreline is a wonderful experience and to be done at a slow cadence. This …

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50.0 km

End point

Parking

Way Types & Surfaces

Way Types

48.0 km

1.56 km

347 m

118 m

Surfaces

48.0 km

1.91 km

118 m

Elevation

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

Highest point (540 m)

Lowest point (230 m)

Weather

Saturday 10 October

13°C

5°C

10 %

Additional weather tips

Max wind speed: 11.0 km/h

to get more detailed weather forecasts along your route

Comments

August 9, 2021,Lake Vyrnwy circular plus viewpoint climb - with VIDEO of Road Conditions

Sadly the climb to the viewpoint is by far the best part, but also scarily hard. Was really lovely. The ride around the lake was a bit boring as there are so many trees, but the boat club and dam were good