Tanygrisiau, near Blaenau Ffestiniog, Gwynedd, North Wales
Tanygrisiau Reservoir
Reservoir
Source image
7.4
Wildland
1–2 hours
Time
Check
Cost
Atmospheric
Feel
Why it's Wildland
7.4Mountain water, slate workings and a lakeside railway: a landscape shaped as much by industry as by the Moelwyn mountains.
The interest here goes beyond a pretty stretch of water. Slate-quarrying slopes, the Ffestiniog Railway and a pumped-storage reservoir give a compact waterside walk a distinctive industrial mountain setting.
Atmospheric · Dramatic
Find your way
Open mapTanygrisiau, near Blaenau Ffestiniog, Gwynedd, North Wales
Opening map…
The experience
Follow the published reservoir circuit for changing views across Llyn Ystradau towards the Moelwyn landscape. Allow extra time for photographs and wet ground, then finish at the lakeside café if open. This is a shore-based visit: AllTrails warns against swimming and other water activities because of depth and submerged catchment infrastructure.
Things to do
Walk around Llyn Ystradau
Use the published 4.7 km circular route for views across the reservoir. AllTrails grades it moderate and records 86 m of ascent; boggy sections mean this is not simply a paved lakeside promenade. Check current passability.
1–1.5 hours walking; allow longer for stops
Frame the water against the industrial mountain landscape
Pause on the walking route for views combining the reservoir, rugged Moelwyn slopes and slate-quarrying landscape. The contrast is the defining subject here, rather than an untouched mountain lake.
Finish beside the lakeside railway
Look for the Ffestiniog Railway running beside the village and reservoir, then stop at the nearby café if open. A passing train is not guaranteed.
Make a day of it
Quick escape · 1–2 hours
Quick escape — the reservoir circuit
- 01
Start from the Tanygrisiau station area, checking parking signs and the current route map.
- 02
Follow the published 4.7 km AllTrails circuit, allowing extra time for wet sections and photographs across the water.
- 03
Notice the lakeside railway and the surrounding slate-working landscape.
- 04
Return to the start; turn back rather than force a crossing or continue past a closure. Stay out of the reservoir.
Half day · Half day
Half day — water, slate and a café stop
- 01
Walk the reservoir circuit in suitable conditions, keeping time aside for the railway and mountain views.
- 02
Stop at the lakeside café if open; confirm opening arrangements before travelling.
- 03
Continue to Blaenau Ffestiniog for a town-centre stroll among the slate pillars and Lleucu Gwenllian's murals opposite the station.
- 04
Look for the murals' quarrying and mythology references, connecting the waterside landscape with the town that grew around slate.
Verified history
Llyn Ystradau is an engineered reservoir, not simply a mountain lake. It forms the lower part of a pumped-storage system: water is pumped uphill to Llyn Stwlan on the Moelwyn Mawr slope and released back down to generate electricity. The surrounding landscape carries an older industrial story too, with Cwmorthin Quarry and Wrysfan Slate Mine north of Tanygrisiau. The Ffestiniog Railway still runs beside the village and water, bringing another strand of that industrial landscape into view.
Hidden details
The steps in the village name — AllTrails translates Tanygrisiau as 'below the steps', relating the name to the quarries on the slopes north of the village. It is a useful clue to reading the worked landscape above the water.
The other reservoir in the story — The water here is linked operationally to Llyn Stwlan higher on the mountain. Understanding that uphill connection changes the view from a scenic lake into part of an electricity-generating system; this is not a recommendation to enter operational areas.
When to go
· Daylight; no particular hour is established by the supplied evidence.
The source row recommends spring and summer. No specific seasonal wildlife or flowering peak is substantiated.
Boggy paths, wet grass and stream crossings are reported. Wear suitable walking footwear and check recent conditions. AllTrails warns against swimming and other water activities because of depth and submerged catchment tubes; do not treat shoreline access as permission to enter the water.
Worth pairing with
Lakeside Cafe, Tanygrisiau
A natural finish to the reservoir walk, rather than a separate detour. Confirm opening hours and parking arrangements before relying on it.
Blaenau Ffestiniog town centre
Extend the slate story with the town's slate pillars and Lleucu Gwenllian murals opposite the station. Visit Wales also identifies independent cafés, shops and pubs for a longer stop.
What to look for
- 01
The railway beside the water
- 02
slate-quarrying traces on the surrounding slopes
- 03
the contrast between the reservoir's calm surface and its role in electricity generation.
The story
Industry
Best time to go
Spring and summer for the walk; choose a clear day after relatively dry weather.
Spring and summer are suggested by the source row, but visibility and recent rainfall matter more than a particular month. Choose daylight and relatively dry conditions for the boggy sections and stream crossings.
How long to spend
1–2 hours
Perfect for
Walkers · Photographers · History lovers
Practical information
Opening & access
Published walking routes describe a circuit around the reservoir. Check current path conditions before setting out: boggy ground, stream crossings and stiles are reported, and one walker reported being unable to complete the circuit.
Check before visiting
Parking
Parking is reported beside Tanygrisiau railway station and at the Lakeside Cafe. Walkiees describes both as free; check current signs and any customer restrictions before leaving your car.
Check before visiting
Toilets
Walkiees lists toilets, but their location and opening arrangements are not established. Check before visiting.
Check before visiting
Food & drink
A lakeside café is identified by both AllTrails and Walkiees. Check current opening hours before relying on refreshments.
Check before visiting
Dogs
AllTrails says dogs are welcome and leads are needed around livestock. Walkiees reports two stiles, one without a dog gap, so lifting may be necessary. Keep dogs out of the reservoir given the reported water hazards.
Accessibility
The reported circuit includes slate gravel, grass, wet sections, stream crossings and two stiles. It should not be presented as a step-free route. Check before visiting.
Check before visiting
Cost
Check before visiting
Check before visiting
Water
Reservoir
Gallery
Place photographsKeep exploring
Around Tanygrisiau Reservoir
Within 50 km · approximate straight-line distances
