to Forestry Commission home page

A new body, Natural Resources Wales has taken over the functions previously carried out by Forestry Commission Wales.
For a limited period some of Natural Resources Wales online services will continue to be provided on this website.

Alwen Dam

About Alwen Dam

The reservoir and dam were constructed between 1909 and 1921 to provide piped water to Birkenhead. Today the reservoir supplies water to homes across north-east Wales producing about 5 million gallons of water a day.

The Alwen reservoir is now encircled by the family friendly Alwen Trail - a new 7 mile / 15.5km way-marked route for walkers and cyclists to explore this beautiful area.


How to get there:

Alwen Dam is in Alwen which is part of Hiraethog Forest.
Follow the A5 to Cerrigydrudion and then take the B4501 north from there to the Alwen Reservoir Forestry Commission Wales car park on the left shortly after the Pont yr Alwen junction. Alternatively take the B4501 from Denbigh. The turning is on the right after the visitor centre.
Cerrigydrudion is the nearest town or village.
OS Grid Reference: SH 955 530
For details of public transport visit

Other places to go in Alwen

Alwen Dam from the Alwen Trail




WalkingFishingWildlife ActivitiesView Point
Cycling Alwen Trail
HorseRiding.gif Horse access permitted on forest roads only


Mike Whitley
Local Area Manager
0300 065 3000

What's of interest

phone App
Get the FC Wales app for free

Short walks on the lake shore and great views from the dam itself. Fishing is what brings most people here and permits are available from the Llyn Brenig Visitor Centre 1.5 miles away to the north.

Trails around Llyn Brenig and the Alwen

Related pages

Useful sites