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United Kingdom
Wales
North Wales
Conwy

Alwen Reservoir

The best MTB trails around Alwen Reservoir

4.4

(13)

122

riders

12

rides

Mountain biking around Alwen Reservoir offers a network of trails within the Hiraethog Forest and surrounding moorlands in North Wales. The area features diverse terrain, including wide forest roads, single gravel trails, and narrower tracks, with routes largely free of cars. The reservoir itself is the largest man-made lake in Wales, and the trails often provide views of the water and distant Eryri National Park mountains. Connectivity to Llyn Brenig extends the riding possibilities, with undulating terrain and varied climbs…

Last updated: May 20, 2026

4.0

(2)

23

riders

#1.

A circuit of Clocaenog Forest and the Alwen and Brenig Reservoirs

48.1km

04:06

740m

740m

Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.

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Moderate

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate
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Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate

Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.

Moderate

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate
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Popular around Alwen Reservoir

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A hidden jewel of North Wales — cycling Llyn Brenig

Mountain Biking Collection by

Katherine Moore

Tips from the Community

Kentishbob
August 5, 2024, Llyn Brenig

Though it was not a tough or technical ride, it did take me into territory I had never visited before and was a lovely antidote to the 'fleshpots' of Gwydir Forest or Coed-y-Brenin. Some lovely gentle singletrack, beautiful views and I didn't see another rider for the whole trip - although tbh I did set off at 08.30 on a Wednesday!!

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Alwen Reservoir is the largest human-made lake in Wales and it makes for a lovely walk. There's a car park at its eastern end and the 6-mile (10 km) loop of the reservoir is wonderfully scenic and suitable for the whole family. The mixture of lake views, woodland and open moorland make it a real treat.

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This bridge across the 900-acre (364 ha) Alwen Reservoir enables a beautiful and tranquil loop of the Wales' largest artificial lake. The views across the water and to the surrounding woodland and hills are lovely.

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Explore over 2500 acres of forest, moorland and lakes amid stunning upland scenery. With visitor centre, café, gift shop, osprey exhibition, adventure playground, cycle hire, mountain biking, walking trails, sailing and world class fishing to discover. Perfect cycling conditions for all ages and abilities. Hire from a wide range of bikes or bring your own ride. Enjoy a gentle family ride on an e-bike or an exhilarating mountain bike adventure.

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Llyn Brenig is a reservoir located on Denbigh Moors in North Wales. The artificial lake, which was constructed between 1973 and 1976, was created by building an embankment dam across the Afon Brenig valley. It lies at 1,200 ft above sea level on the border between the counties of Conwy and Denbighshire.

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An easy ride for all abilities

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An easy route for all abilities

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An easy route for all the family to enjoy, although you might want to go int he warmer months of the year. It can be very wet and windy up here in the Winter.

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Frequently Asked Questions

How many mountain bike trails are available around Alwen Reservoir?

There are over 10 mountain bike trails around Alwen Reservoir, offering a range of experiences from easy to moderate difficulty. The area is known for its car-free routes and diverse terrain within the Hiraethog Forest.

What kind of terrain can I expect on the mountain bike trails around Alwen Reservoir?

The trails feature a mix of surfaces, including wide forest roads, single gravel trails, and narrower tracks. You'll encounter undulating terrain with some climbs and descents, providing varied riding through conifer forests, moorlands, and along the reservoir's edge.

Are there mountain bike trails suitable for beginners or families?

Yes, there are several easy routes perfect for beginners and families. For example, the Alwen Trail itself is largely graded as easy to moderate. One specific easy route is Llyn Brenig Dam – Llyn Brenig loop from Llyn Brenig Visitor Centre, which is 13 miles (20.9 km) long.

Are there longer, more challenging mountain bike routes for experienced riders?

Absolutely. For experienced riders seeking a longer adventure, routes like A circuit of Clocaenog Forest and the Alwen and Brenig Reservoirs offer a substantial 29.9 miles (48.1 km) ride through extensive forest, linking both reservoirs. Another challenging option is Llyn Brenig Visitor Centre – Llyn Brenig loop from Llyn Brenig Visitor Centre, which is 30.8 miles (49.6 km) long.

What natural features or landmarks can I see while mountain biking around Alwen Reservoir?

You'll encounter diverse scenery, from the tranquil waters of Alwen Reservoir (the largest man-made lake in Wales) to the expansive Hiraethog Forest and moorlands. The historic Alwen Dam, with its Italian-style valve tower, is a notable architectural feature. Many trails offer stunning views across the reservoir and towards the distant Eryri National Park (Snowdonia) mountains. Keep an eye out for local wildlife, including rare birds and elusive red squirrels.

Are there any circular mountain bike routes around Alwen Reservoir?

Yes, many routes around Alwen Reservoir are circular. The Alwen Trail itself is a popular circular route around the reservoir. A great example is Alwen Dam – View of Alwen Reservoir loop from Alwen Dam, a 10.9 miles (17.5 km) trail that provides a scenic loop through varied terrain.

Can I connect to other trail networks from Alwen Reservoir?

Yes, the Alwen Trail connects to the nearby Llyn Brenig via the 'Two Lakes Link Trail' and the 'Two Lakes Trail'. This allows for extended routes, offering up to 14.1 miles of additional riding and enhancing the overall visitor experience with more amenities at Llyn Brenig.

Is there parking available for mountain bikers at Alwen Reservoir?

Yes, parking is available at Alwen Reservoir, often near the Alwen Dam, which serves as a common starting point for many trails. Specific parking details can usually be found on local signage or visitor information boards upon arrival.

Are there facilities like cafes or toilets near the mountain bike trails?

While Alwen Reservoir itself has limited direct facilities, the nearby Llyn Brenig, which is connected by trails, offers a visitor center with amenities such as a café and toilets. This makes it a convenient stop for refreshments and facilities during a longer ride connecting the two lakes.

Are dogs allowed on the mountain bike trails around Alwen Reservoir?

Generally, dogs are welcome on trails in the Hiraethog Forest and around Alwen Reservoir, but they should be kept under close control, especially near livestock or wildlife. Always check local signage for any specific restrictions or requirements, particularly regarding lead usage.

What do other mountain bikers say about the trails around Alwen Reservoir?

The mountain bike trails around Alwen Reservoir are highly rated by the komoot community, with an average score of 4.4 stars from over 10 reviews. Riders often praise the quiet, car-free routes, the diverse terrain, and the stunning views across the reservoir and surrounding moorlands.

What is the best time of year to go mountain biking at Alwen Reservoir?

The trails are enjoyable year-round, but spring and autumn offer particularly pleasant conditions with milder temperatures and beautiful scenery. Summer is also popular, while winter rides can be invigorating, though appropriate gear for potentially wet and cold conditions is essential.

Are there good viewpoints along the mountain bike trails?

Yes, the trails offer numerous viewpoints. As you cycle, you'll find elevated positions on the moorlands providing stunning panoramas across Alwen Reservoir and towards the distant Eryri National Park mountains. The Alwen Dam itself also offers impressive views of the lake and surrounding landscape.

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