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Lake Vyrnwy Dam – Bwlch y Groes loop from Hendre Car Park

Lake Vyrnwy Dam – Bwlch y Groes loop from Hendre Car Park

Hard

riders

Lake Vyrnwy Dam – Bwlch y Groes loop from Hendre Car Park

04:41

81.7km

1,530m

Road cycling

Hard road ride. Very good fitness required. Some segments of this route may be unpaved and difficult to ride. The starting point of the route is right next to a parking lot.

Last updated: July 11, 2026

Tips

The surface along some of this route may not be suitable

Some segments of your route comprise a surface that may not be suitable for your chosen sport.

After 0 m for 291 m

After 81.5 km for 291 m

Waypoints

Start point

Parking

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7.14 km

Lake Vyrnwy Dam

Highlight (Segment) • Viewpoint

The dam across the Vyrnwy Valley, Montgomeryshire, was the first large masonry dam, and was completed in 1888. Water from the reservoir supplies Liverpool, travelling there along a 70 mile aqueduct.

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7.53 km

Lake Vyrnwy Dam

Highlight • Monument

This is brilliant peice of architecture thats still in use today, you can feel the sheer power of the flow of water down the dam one side, and the peace and tranquility of the lake the other.

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8.21 km

View of the Straining Tower at Lake Vyrnwy

Highlight • Monument

Some great views along this part of the road, well worth a visit.

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10.5 km

Nant y Maes Waterfall

Highlight • River

Along the road you come to a small bridge at the side of it is a beautiful natural waterfall close to Nant y Maes stream.
Stunning waterfall that meets the lake

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14.7 km

Bwlch y Groes Climb from Lake Vyrnwy

Highlight (Segment) • Viewpoint

Climbed it 30 odd years ago........with young fit legs!! Recently descended it in heavy rain with bike packing gear - makes for a bottom clenching descent - exercise caution at the bottom, there's a tight left hand bend, beware!!

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21.0 km

View of the Valley from Bwlch y Groes

Highlight • Mountain Pass

The climb up to Bwlch-y-Groes from Llanymawddwy is a tough one. It is about 3.4 km long and has about 387 m of vertical ascent to get to the gap …

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21.0 km

Bwlch y Groes

Highlight (Segment) • Mountain Pass

The second highest public road mountain pass in Wales this is definitely one to tick off the cycling bucket list. It is narrow and winding so it is recommended to …

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81.7 km

End point

Parking

Way Types & Surfaces

Way Types

67.5 km

9.92 km

3.87 km

553 m

Surfaces

58.1 km

23.2 km

553 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 (30 m)

Weather

Thursday 23 July

22°C

11°C

0 %

Additional weather tips

Max wind speed: 15.0 km/h

to get more detailed weather forecasts along your route

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Lake Vyrnwy Dam – Bwlch y Groes loop from Hendre Car Park

Lake Vyrnwy Dam

Lake Vyrnwy Dam

View of the Straining Tower at Lake Vyrnwy

Nant y Maes Waterfall

Bwlch y Groes Climb from Lake Vyrnwy

View of the Valley from Bwlch y Groes

Bwlch y Groes

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