Llyn Ystradau - Tanygrisiau Reservior
85 ha
Plan your visit
🦅Birds🦉Wildlife🦋Insects
Public accessFree entryDogs welcome85 ha
Getting here
52.97916, -3.96697
Open directionsv
Visiting this summer
Seasonal nature notes and what to look for now
- 🐦63+ species recorded in this area — summer evenings are best for activity; watch for Canada Goose and Stonechat
- 🐕Early mornings are best for dog walks in summer — visit before 9am to avoid the heat and find quieter trails
- 📍Open access throughout summer — no booking required
🌤️ Visiting this summer
- 🐦63+ species recorded in this area — summer evenings are best for activity; watch for Canada Goose and Stonechat
- 🐕Early mornings are best for dog walks in summer — visit before 9am to avoid the heat and find quieter trails
- 📍Open access throughout summer — no booking required
- £Free to visit — no entry charge
- 🐕Dogs welcome
🦅Bird watching
Very strong match
Birds — Canada Goose, Stonechat, Robin +60 more · last seen 2025; Reservoir — wildfowl and wading birds
Free
Birds — Canada Goose, Stonechat, Robin +60 more · last seen 2025; Reservoir — wildfowl and wading birds
Free
🦋Insect spotting
Strong match
Insects — Painted Lady, Peacock, Orange Ladybird +130 more · last seen 2025
Free
🍂Seasonal nature
Strong match
Plants — Green Hoar-moss, Ostrich-plume Feather-moss, Japanese Knotweed +195 more · last seen 2025
Free
Dogs allowed with public access
Free
〰Waterside walks
Good match
Reservoir — waterside public access
Varies
Trails nearby
Within roughly 5 km2 signed routes nearby · 3 public paths nearby
Signed route nearbyPublic paths
Snowdonia Slate TrailWalking route▾
Named routeRegional walking route
Cambrian WayWalking route▾
Named routeNational walking route
12 signed routes nearby
Signed route nearby
National Cycle Network National Route 82Cycling route▾
Named routeRef 82National Cycle Network
Main RouteCycling route708 m▾
Named routeRef 82Length 708 mNational Cycle NetworkOn-roadSurface asphalt
Main RouteCycling route325 m▾
Named routeRef 82Length 325 mNational Cycle NetworkOn-roadSurface asphalt
Alternative RouteCycling route66 m▾
Named routeRef 82Length 66 mNational Cycle NetworkOn-roadSurface asphalt
Main RouteCycling route23 m▾
Named routeRef 82Length 23 mNational Cycle NetworkOn-roadSurface asphalt
Main RouteCycling route601 m▾
Named routeRef 82Length 601 mNational Cycle NetworkTraffic-freeSurface asphalt
Photos
Llyn Tanygrisiau, Blaenau Ffestiniog, Gwynedd, Cymru (Wales) - hydroelectric power from Llyn Stwlan opened 1961 06
Weather for this location
Next 14 daysNearby places
Useful places within 5 km
Wildlife to spot
4,850 records · National Biodiversity Network
Wildlife to spot
4,850 records · National Biodiversity Network🐦Birds53 species
springsummer
2025▾
Blackbird · Robin · Raven · Stonechat · Chaffinch +48
- BlackbirdTurdus merula
- RobinErithacus rubecula
- RavenCorvus corax
- StonechatSaxicola rubicola
- ChaffinchFringilla coelebs
- Canada GooseBranta canadensis
- DunnockPrunella modularis
- Blue TitCyanistes caeruleus
- Meadow PipitAnthus pratensis2024
- Willow WarblerPhylloscopus trochilus
- Carrion CrowCorvus corone
- SwallowHirundo rustica
- WrenTroglodytes troglodytes
- Great TitParus major
- ChiffchaffPhylloscopus collybita
- House SparrowPasser domesticus
- Grey HeronArdea cinerea
- RedstartPhoenicurus phoenicurus
- CuckooCuculus canorus
- MagpiePica pica
- Herring GullLarus argentatus
- Grey WagtailMotacilla cinerea
- Song ThrushTurdus philomelos2024
- Common SandpiperActitis hypoleucos2024
- JackdawColoeus monedula
- Ring OuzelTurdus torquatus
- TreecreeperCerthia familiaris
- WhinchatSaxicola rubetra
- WhitethroatCurruca communis
- Mistle ThrushTurdus viscivorus
- Tree PipitAnthus trivialis
- SwiftApus apus
- GoldfinchCarduelis carduelis
- Lesser RedpollAcanthis flammea cabaret2024
- KestrelFalco tinnunculus2024
- Great Spotted WoodpeckerDendrocopos major2024
- NuthatchSitta europaea2024
- Pied WagtailMotacilla alba yarrellii2024
- Garden WarblerSylvia borin
- BlackcapSylvia atricapilla
- Turdus torquatus torquatusTurdus torquatus torquatus
- DipperCinclus cinclus2024
- Rock DoveColumba livia2024
- BullfinchPyrrhula pyrrhula2024
- Collared DoveStreptopelia decaocto2024
- SiskinSpinus spinus2024
- JayGarrulus glandarius2024
- MallardAnas platyrhynchos2024
- YellowhammerEmberiza citrinella2024
- Tawny OwlStrix aluco2024
- SkylarkAlauda arvensis2024
- WheatearOenanthe oenanthe2024
- House MartinDelichon urbicum2024
Lesser Horseshoe Bat
- Lesser Horseshoe BatRhinolophus hipposideros
Common Lizard · Slow-worm
- Common LizardZootoca vivipara
- Slow-wormAnguis fragilis
🐝Insects32 species
summerautumn
2025▾
Birch Shieldbug · Orange Ladybird · Black Darter · Common Darter · Chilenocaecilius ornatipennis +27
- Birch ShieldbugElasmostethus interstinctus2024
- Orange LadybirdHalyzia sedecimguttata2024
- Black DarterSympetrum danae
- Common DarterSympetrum striolatum
- Chilenocaecilius ornatipennisChilenocaecilius ornatipennis2024
🌿Plants3 species
springsummerautumn
2025▾
Japanese Knotweed · Narrow-leaved Ragwort · Water Lobelia
- Japanese KnotweedReynoutria japonica
- Narrow-leaved RagwortSenecio inaequidens
- Water LobeliaLobelia dortmanna
Species observations from the last 10 years via NBN Atlas
Wildlife to spot
4,850 records · National Biodiversity Network🐦Birds53 species
springsummer
2025▾
Blackbird · Robin · Raven · Stonechat · Chaffinch +48
- BlackbirdTurdus merula
- RobinErithacus rubecula
- RavenCorvus corax
- StonechatSaxicola rubicola
- ChaffinchFringilla coelebs
- Canada GooseBranta canadensis
- DunnockPrunella modularis
- Blue TitCyanistes caeruleus
- Meadow PipitAnthus pratensis2024
- Willow WarblerPhylloscopus trochilus
- Carrion CrowCorvus corone
- SwallowHirundo rustica
- WrenTroglodytes troglodytes
- Great TitParus major
- ChiffchaffPhylloscopus collybita
- House SparrowPasser domesticus
- Grey HeronArdea cinerea
- RedstartPhoenicurus phoenicurus
- CuckooCuculus canorus
- MagpiePica pica
- Herring GullLarus argentatus
- Grey WagtailMotacilla cinerea
- Song ThrushTurdus philomelos2024
- Common SandpiperActitis hypoleucos2024
- JackdawColoeus monedula
- Ring OuzelTurdus torquatus
- TreecreeperCerthia familiaris
- WhinchatSaxicola rubetra
- WhitethroatCurruca communis
- Mistle ThrushTurdus viscivorus
- Tree PipitAnthus trivialis
- SwiftApus apus
- GoldfinchCarduelis carduelis
- Lesser RedpollAcanthis flammea cabaret2024
- KestrelFalco tinnunculus2024
- Great Spotted WoodpeckerDendrocopos major2024
- NuthatchSitta europaea2024
- Pied WagtailMotacilla alba yarrellii2024
- Garden WarblerSylvia borin
- BlackcapSylvia atricapilla
- Turdus torquatus torquatusTurdus torquatus torquatus
- DipperCinclus cinclus2024
- Rock DoveColumba livia2024
- BullfinchPyrrhula pyrrhula2024
- Collared DoveStreptopelia decaocto2024
- SiskinSpinus spinus2024
- JayGarrulus glandarius2024
- MallardAnas platyrhynchos2024
- YellowhammerEmberiza citrinella2024
- Tawny OwlStrix aluco2024
- SkylarkAlauda arvensis2024
- WheatearOenanthe oenanthe2024
- House MartinDelichon urbicum2024
Lesser Horseshoe Bat
- Lesser Horseshoe BatRhinolophus hipposideros
Common Lizard · Slow-worm
- Common LizardZootoca vivipara
- Slow-wormAnguis fragilis
🐝Insects32 species
summerautumn
2025▾
Birch Shieldbug · Orange Ladybird · Black Darter · Common Darter · Chilenocaecilius ornatipennis +27
- Birch ShieldbugElasmostethus interstinctus2024
- Orange LadybirdHalyzia sedecimguttata2024
- Black DarterSympetrum danae
- Common DarterSympetrum striolatum
- Chilenocaecilius ornatipennisChilenocaecilius ornatipennis2024
🌿Plants3 species
springsummerautumn
2025▾
Japanese Knotweed · Narrow-leaved Ragwort · Water Lobelia
- Japanese KnotweedReynoutria japonica
- Narrow-leaved RagwortSenecio inaequidens
- Water LobeliaLobelia dortmanna
Species observations from the last 10 years via NBN Atlas
Hazel Leaf-roller
Hazel Leaf-roller
Apoderus coryli2024
Apoderus coryli2024
Bilberry BumblebeeBombus monticola2024Bilberry BumblebeeBombus monticola2024Emerald DamselflyLestes sponsaEmerald DamselflyLestes sponsaCommon HawkerAeshna junceaCommon HawkerAeshna junceaCommon Blue DamselflyEnallagma cyathigerumCommon Blue DamselflyEnallagma cyathigerumGlow-wormLampyris noctilucaGlow-wormLampyris noctilucaLarge Red DamselflyPyrrhosoma nymphulaLarge Red DamselflyPyrrhosoma nymphulaLarge Willow AphidTuberolachnus (Tuberolachnus) salignus2024Large Willow AphidTuberolachnus (Tuberolachnus) salignus2024Bryocoris pteridisBryocoris pteridis2024Bryocoris pteridisBryocoris pteridis2024Cionus tuberculosusCionus tuberculosus2024Cionus tuberculosusCionus tuberculosus2024Baccha elongataBaccha elongata2024Baccha elongataBaccha elongata2024Evacanthus interruptusEvacanthus interruptus2024Evacanthus interruptusEvacanthus interruptus202410-spot LadybirdAdalia decempunctata202410-spot LadybirdAdalia decempunctata2024Cicadella viridisCicadella viridis2024Cicadella viridisCicadella viridis2024Common Red Soldier BeetleRhagonycha fulva2024Common Red Soldier BeetleRhagonycha fulva2024Green Tiger BeetleCicindela campestris2024Green Tiger BeetleCicindela campestris2024Cantharis pellucidaCantharis pellucida2024Cantharis pellucidaCantharis pellucida2024Garden ChaferPhyllopertha horticola2024Garden ChaferPhyllopertha horticola2024Tree BumblebeeBombus hypnorum2024Tree BumblebeeBombus hypnorum2024CteniceraCtenicera2024CteniceraCtenicera2024Bloody-nosed BeetleTimarcha tenebricosa2024Bloody-nosed BeetleTimarcha tenebricosa2024Orchid BeetleDascillus cervinus2024Orchid BeetleDascillus cervinus2024Tree HopperCentrotus cornutus2024Tree HopperCentrotus cornutus2024Polydrusus tereticollisPolydrusus tereticollis2024Polydrusus tereticollisPolydrusus tereticollis2024Rhagonycha nigriventrisRhagonycha nigriventris2024Rhagonycha nigriventrisRhagonycha nigriventris2024Dryophilocoris (Dryophilocoris) flavoquadrimaculatusDryophilocoris (Dryophilocoris) flavoquadrimaculatus2024Dryophilocoris (Dryophilocoris) flavoquadrimaculatusDryophilocoris (Dryophilocoris) flavoquadrimaculatus2024Cartodere nodiferCartodere nodifer2024Cartodere nodiferCartodere nodifer2024Events & activities nearby
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