Routes

Planner

Features

Updates

App

Get the App

Lakes

Clywedog Dam

Lakes

Clywedog Dam

Highlight • Lake

Clywedog Dam

Recommended by 13 hikers out of 14

Save

Location: Llanidloes Without, Powys, Wales, United Kingdom

Save

See hikes here

Take Me There

Routes here

Best Hikes to Clywedog Dam

4.1

(8)

hikers

1. Clywedog Dam – Yr Allt Summit Path loop from Y Fan

5.21km

01:35

160m

Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

Navigate

Send to Phone

Save

Easy

hikers

2. Clywedog Dam loop from Y Fan

5.30km

01:39

200m

Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

Navigate

Send to Phone

Save

Easy

5.0

(1)

hikers

3. Clywedog Dam – Clywedog Reservoir loop from Y Fan

11.3km

03:17

290m

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Navigate

Send to Phone

Save

Moderate

Tips

Alex Foxfield

October 22, 2025

Built primarily to regulate the flow of water in the River Severn, the Clywedog Dam is an impressive sight. It's the tallest concrete dam in Britain, at 236 feet (72 m) high, while it's also 750 feet (230 m) wide. There are two marked hiking trails on the reservoir.

Zoe Evans

October 28, 2023

Llyn Clywedog was the Tallest in the British Isle built purposely to control the level of water to help prevent any future flooding from the source of the River Seven. By Building this absolutely incredible huge 6 mile long dam, one that was the tallest in the British isles, which is amazingly huge in actual size all around! This mammoth body of water is solely to take the huge pressure off the constant mass of floods which would fill up and submerge the surrounding valleys! At the foot of the dam there is a remains of a old lead mine! All structures you can see standing still today. HIGHLY RECOMMEND

In the know? Log-in to add a tip for other adventurers!

Details

Informations

Elevation 310 m

Weather

Today

Saturday 20 December

8°C

5°C

12 %

Additional weather tips

Max wind speed: 25.0 km/h

Most visited during

January

February

March

April

May

June

July

August

September

October

November

December

See hikes here

Take Me There

Location: Llanidloes Without, Powys, Wales, United Kingdom

Other Popular Places to Check Out

Bryn y Fan Summit

Source of the River Severn

Llyn Clywedog

Hafren Cascades Boardwalk

View of the Valley and Reservoir

Pen Pumlumon Arwystli

Hafren Forest Boardwalk

Llyn Clywedog Reservoir and Dam

Picnic Table With View of River Valley

Hafren Forest Lane

Hafren Forest Road

Cwm Ystwyth Valley

Clywedog Dam

1. Clywedog Dam – Yr Allt Summit Path loop from Y Fan

2. Clywedog Dam loop from Y Fan

3. Clywedog Dam – Clywedog Reservoir loop from Y Fan

Other Popular Places to Check Out

We value your privacy ⛰️

We value your privacy ⛰️