Garreg Ddu to Craig Goch running loop
Garreg Ddu to Craig Goch running loop
5.0
(1)
34
runners
Garreg Ddu to Craig Goch running loop
01:45
15.9km
190m
Running
Embark on the difficult Garreg Ddu to Craig Goch running loop, a challenging 9.9 miles (15.9 km) journey through the scenic Elan Valley. You will gain 607 feet (185 metres) in elevation, with an estimated duration of 1 hours and 44 minutes. As you jog, you will trace the edges of reservoirs like Garreg Ddu and Pen y Garreg, eventually reaching the elegantly curved Craig Goch Dam, a true engineering marvel.
For your visit, parking is readily available at the Visitor Centre, which also provides easy access to the start of the route. The path is generally well-maintained, featuring some tarmacked sections near the Visitor Centre that are suitable for various users. Be aware that the trail also includes narrow woodland areas with exposed tree roots and potentially wet spots, so choose your footwear accordingly.
This route follows the historic old Birmingham Corporation Railway path, blending these tarmacked sections with more natural woodland trails. Keep an eye out for Red Kites soaring above the expansive Welsh hills, adding to the natural beauty of your run. The loop is notable for combining the best of the Elan Valley Trail with significant distance and elevation changes, offering a rewarding experience.
Last updated: April 23, 2026
Waypoints
Start point
Parking
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362 m
Elan Valley Trail
Highlight • River
Tip by
6.71 km
Pen-y-Garreg Dam
Highlight • Viewpoint
The Pen-y-Garreg is the third Dam up through the Elan Valley, also to be known as the 'Middle Dam'.
Pen-y-Garreg Dam is unusual in that it houses an access tunnel to the central tower which is lit by apertures in the downstream side of the dam.
The viaduct at Garreg Ddu further downstream does not resemble the other dams since the dam part of the structure is not visible above the water surface in normal conditions. There are atotal of four dams on the river Elan;.
Craig Goch.
Pen-y-Garreg.
Garreg-Ddu.
Caban Coch.
The river Claerwen has the newest and largest, Claerwen Dam followed by the unfinished Dol y Mynach dam.
With the exception of Dol y Mynach all the dams are also accessible by car.
Tip by
14.9 km
Caban Coch Dam
Highlight • Natural Monument
Tip by
15.9 km
End point
Parking
Way Types & Surfaces
Way Types
9.96 km
3.16 km
2.31 km
520 m
Surfaces
5.57 km
5.28 km
4.60 km
322 m
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Elevation
Highest point (300 m)
Lowest point (220 m)
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Weather
Powered by Foreca
Wednesday 6 May
13°C
6°C
32 %
Additional weather tips
Max wind speed: 15.0 km/h
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This route was planned by komoot.
Frequently Asked Questions
What is the terrain like on the Garreg Ddu to Craig Goch running loop?
The terrain is quite varied. Much of the route follows the old Birmingham Corporation Railway, offering mostly flat or gentle gradients. You'll find tarmacked sections, especially near the start, transitioning to reservoir-side paths and woodland trails. Be aware that some wooded areas can be narrow with exposed tree roots, and certain spots might be wet underfoot. There's a gradual incline up through trees towards Pen y Garreg Dam.
How challenging is this running loop?
While individual sections of the wider Elan Valley Trail are considered easy, this specific 15.9 km loop is rated as 'difficult' on komoot. It involves a cumulative elevation gain of about 185 meters, which, combined with the distance, makes it a significant challenge for joggers. Expect some gradual inclines, particularly on the way to Pen y Garreg Dam.
What can I see along the route?
This loop offers stunning views of the Elan Valley's iconic reservoirs and historic dams. You'll trace the edges of Garreg Ddu, Pen y Garreg, and Craig Goch reservoirs. Key landmarks include the Pen-y-Garreg Dam and the elegant Craig Goch Dam, often called the 'top dam'. The Caban Coch Dam is also nearby. The scenery includes lush countryside, attractive woodlands, and expansive Welsh hills, with opportunities to spot wildlife like Red Kites.
Where can I park to access the Garreg Ddu to Craig Goch running loop?
The Elan Valley Visitor Centre is a common starting point with ample parking. From there, you can easily access the trail that leads towards Garreg Ddu and the rest of the loop. Parking is generally available at various points along the Elan Valley Trail, but the Visitor Centre offers good facilities.
Is the Garreg Ddu to Craig Goch running loop dog-friendly?
Yes, the Elan Valley Trail, including this loop, is generally dog-friendly. However, it's crucial to keep dogs on a lead, especially around livestock, wildlife, and other trail users. Always follow the Countryside Code and clean up after your dog.
What is the best time of year to run this loop?
Spring and autumn offer pleasant temperatures and beautiful scenery with changing foliage or blooming wildflowers. Summer is also popular, but can be warmer. Winter running is possible, but be prepared for potentially wet and muddy conditions, and shorter daylight hours. The Elan Valley is also an International Dark Sky Park, making it unique for stargazing if you're out at dusk.
Are there any permits or entrance fees required for the Elan Valley?
No, there are no specific permits or entrance fees required to access the Elan Valley or to run this loop. The Elan Valley Estate is privately owned but publicly accessible, managed for conservation and recreation. Parking may incur a small charge at some car parks, such as the Visitor Centre.
Does this trail intersect with other well-known paths?
Yes, this running loop extensively uses sections of the Elan Valley Trail. It also briefly crosses parts of the Trans Cambrian Way and the Cnwch Wood Nature Trail.
Are there any cafes or facilities near the running loop?
The Elan Valley Visitor Centre, located near the start of the wider Elan Valley Trail, offers a cafe and toilet facilities. There are also cafes and pubs in the nearby town of Rhayader, which is a short drive from the valley.
What makes the Craig Goch Dam particularly notable?
Craig Goch Dam, often referred to as the 'top dam', is particularly admired for its elegant curved retaining wall and series of arches. It's a remarkable feat of Victorian engineering and is often highlighted for its distinctive 'Birmingham Baroque' architectural style, making it a beautiful and iconic landmark along the route.
Is the Garreg Ddu Dam always visible?
No, the Garreg Ddu Dam is unique because it is often submerged beneath the reservoir's waters. It only becomes fully visible when the reservoir levels are particularly low, offering a rare glimpse of its structure.