Corrieshalloch Gorge

Site of Special Scientific Interest · 57.7571, -5.0234

Condition (NatureScot)

Favourable (4)
UnitFeatureConditionArea (ha)Assessed
F1 Fluvial Geomorphology of Scotland Favourable 2015-04-01
F2 Quaternary of Scotland Favourable 2009-05-07
F3 Cranefly (Lipsothrix ecucullata) Favourable 2017-05-03
F4 Upland birch woodland Favourable 2007-02-14

Geology & landscape

Geological Feature: Gorge / Ravine · Geological Period: Quaternary

Landscape processes: Fluvial, Glacial

Description

CORRIESHALLOCH GORGE Corrieshalloch Gorge Site of Special Scientific Interest (SSSI) lies in Wester Ross, 19km southeast of Ullapool. This nationally important site is a classic example of a gorge formed by glacial meltwater rivers. The gorge is flanked by nationally important birch woodland which provides suitable habitat for the nationally rare cranefly Lipsothrix ecucullata. Quaternary of Scotland Corrieshalloch Gorge SSSI is one of the most spectacular gorges of its type in Britain and affords striking evidence of how glacial meltwaters can erode deep gorges. The gorge was formed during the Quaternary Ice Age as vast quantities of meltwater were released when the glaciers and ice sheets which existed in northern Scotland between 2.6 million and 11,500 years ago melted. The erosive power of these glacial meltwater torrents is well illustrated at Corrieshalloch, where they carved a slot gorge 1.6km in length and up to 60m in depth into the Moine bedrock. Fluvial (river) geomorphology of Scotland This site is a particularly good example of how weaknesses in the bedrock influence the way rivers cause erosion. Preferential erosion along lines of weakness in the bedrock has worked to form the profile of the gorge, with an impressive series of stepped waterfalls and pools, and the spectacular 45m high Falls of Measach at the head of the gorge. The Abhainn Droma, which flows through the gorge today, provides a striking example of a steep, highly confined and sediment-starved bedrock channel, immediately upstream of a sea loch in a glacial trough. Upland birch woodland The woodland on the steep sides of the gorge contains a broad range of native tree species such as birch Betula pubescens, oak Quercus robur, holly Ilex aquifolium and aspen Populus tremula. The steepness of the gorge and its edge has discouraged grazing animals and as a consequence the woodland has a well-developed understorey with a rich and varied flora. Grasses typical of deep shade are common, with an abundance of wood millet Milium effusum and wood fescue Festuca altissima. Ferns and mosses are abundant and notable species include Wilson’s filmy fern Hymenophyllum wilsonii. Cranefly (Lipsothrix ecucullata) The woodland provides habitat for the nationally rare cranefly species Lipsothrix ecucullata. Adult Lipsothrix ecucullata are found in wet areas in damp, deciduous woodlands, whilst the larvae are found in well decayed wood, lying partially immersed in water.

Species mentioned

English name
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Latin name
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IUCN / Red List Type Family
Wilson's filmy-fern Hymenophyllum wilsonii VU fern hymenophyllaceae
wood fescue Festuca altissima Not listed in GB list grass poaceae
wood millet Milium effusum LC grass poaceae
downy birch Betula pubescens LC tree betulaceae
holly Ilex aquifolium LC tree aquifoliaceae
aspen Populus tremula LC tree salicaceae
common oak Quercus robur LC tree fagaceae

Insects to look out for

These moths, butterflies and beetles are known to feed on plants recorded at this site, and carry a notable UK conservation status — but a host-plant being present doesn't mean the insect has actually been recorded here. Treat this as "worth watching for," not a confirmed sighting.

SpeciesStatusVia host-plant
Oak lutestring
Cymatophorina diluta
Endangered Quercus robur
Dark bordered beauty
Epione vespertaria
Endangered Populus tremula
Scarce vapourer
Orgyia recens
Endangered Betula spp., Quercus spp.
The sprawler
Asteroscopus sphinx
Vulnerable Betula spp., Populus spp., Quercus spp.
Broom moth
Ceramica pisi
Vulnerable Betula spp.
Scarce chocolate-tip
Clostera anachoreta
Vulnerable Populus spp., Populus tremula
Mottled umber
Erannis defoliaria
Vulnerable Betula spp., Populus tremula, Quercus spp.
The lackey
Malacosoma neustria
Vulnerable Quercus spp.
Pale brindled
Phigalia pilosaria
Vulnerable Betula pubescens, Populus spp., Quercus spp.
Early moth
Theria primaria
Vulnerable Quercus spp.
Pale eggar
Trichiura crataegi
Vulnerable Betula spp., Populus spp., Quercus spp.
Oak hook-tip
Watsonalla binaria
Vulnerable Quercus robur
No common name
Zeugophora turneri
Vulnerable Populus tremula
Flounced chestnut
Agrochola helvola
Near Threatened Betula spp., Quercus spp.
Purple emperor
Apatura iris
Near Threatened Populus tremula
Minor shoulder-knot
Brachylomia viminalis
Near Threatened Populus tremula
Light crimson underwing
Catocala promissa
Near Threatened Quercus robur
Dark crimson underwing
Catocala sponsa
Near Threatened Quercus robur
The sallow
Cirrhia icteritia
Near Threatened Populus spp.
Small heath
Coenonympha pamphilus
Near Threatened Festuca spp.
Heart moth
Dicycla oo
Near Threatened Quercus robur
Kentish glory
Endromis versicolora
Near Threatened Betula pubescens
Large thorn
Ennomos autumnaria
Near Threatened Betula spp., Populus spp., Quercus spp.
September thorn
Ennomos erosaria
Near Threatened Betula spp., Quercus spp.
Autumnal rustic
Eugnorisma glareosa
Near Threatened Betula spp.
Grey pug
Eupithecia subfuscata
Near Threatened Populus tremula
Double dart
Graphiphora augur
Near Threatened Betula spp., Quercus spp.
Clay fan-foot
Paracolax tristalis
Near Threatened Quercus spp.
Common fan-foot
Pechipogo strigilata
Near Threatened Quercus robur
Frosted green
Polyploca ridens
Near Threatened Quercus robur
White prominent
Leucodonta bicoloria
Regionally Extinct Betula spp.

Host-plant data: Cook et al. (2025), Traits data for the butterflies and macro-moths of Great Britain and Ireland, 2024, UK Centre for Ecology & Hydrology / Butterfly Conservation; and Padovani et al. (2020), Database of Insects and their Food Plants (DBIF), UK Centre for Ecology & Hydrology (both Open Government Licence). Contains data supplied by UK Centre for Ecology & Hydrology.

Plant communities

W17 — Altantic hazel wood, Atlantic oak wood, Caledonian forest, Upland birch wood, Wood pasture

Quercus petraea-Betula pubescens-Dicranum majus woodland

Matches 4 species from the description above: Betula pubescens, Hymenophyllum wilsonii, Ilex aquifolium, Quercus robur

Hedera helix, Salix caprea, Acer pseudoplatanus, Ilex aquifolium, Betula pendula, Betula pubescens, Corylus avellana, Fagus sylvatica, Quercus hybrid, Quercus petraea, Quercus robur, Fraxinus excelsior, Sorbus aucuparia, Calluna vulgaris, Erica cinerea, Erica tetralix, Juniperus communis, Rhododendron ponticum, Vaccinium myrtillus, Crataegus monogyna, Carex pilulifera, Luzula multiflora, Luzula pilosa, Luzula sylvatica, Andreaea rupestris, Mnium hornum, Rhizomnium punctatum, Campylopus flexuosus, Dicranella heteromalla, Dicranodontium denudatum, Dicranum fuscescens, Dicranum majus, Dicranum scoparium, Dicranum scottianum, Leucobryum glaucum, Ptychomitrium polyphyllum, Racomitrium fasciculare, Racomitrium heterostichum, Racomitrium lanuginosum, Eurhynchium striatum, Heterocladium heteropterum, Hylocomiastrum umbratum, Hylocomium armoricum, Hylocomium splendens, Hypnum callichroum, Hypnum cupressiforme, Hypnum jutlandicum, Isothecium myosuroides, Kindbergia praelonga, Loeskeobryum brevirostre, Plagiothecium denticulatum, Plagiothecium undulatum, Pleurozium schreberi, Pseudoscleropodium purum, Pseudotaxiphyllum elegans, Ptilium crista-castrensis, Rhytidiadelphus loreus, Rhytidiadelphus squarrosus, Rhytidiadelphus triquetrus, Sematophyllum demissum, Sematophyllum micans, Thuidium delicatulum, Thuidium tamariscinum, Polytrichum commune, Polytrichum formosum, Sphagnum capillifolium, Sphagnum fimbriatum, Sphagnum palustre, Sphagnum russowii, Sphagnum subnitens, Tetraphis pellucida, Adelanthus decipiens, Anastrepta orcadensis, Barbilophozia attenuata, Barbilophozia floerkei, Bazzania tricrenata, Bazzania trilobata, Blepharostoma trichophyllum, Calypogeia fissa, Calypogeia muelleriana, Cephalozia bicuspidata, Diplophyllum albicans, Frullania tamarisci, Fuscocephaloziopsis lunulifolia, Harpanthus scutatus, Jamesoniella autumnalis, Jungermannia gracillima, Lepidozia pearsonii, Lepidozia reptans, Lophocolea bidentata, Lophocolea heterophylla, Lophozia ventricosa, Marsupella emarginata, Microlejeunea ulicina, Mylia taylorii, Nowellia curvifolia, Plagiochila asplenioides, Plagiochila atlantica, Plagiochila killarniensis, Plagiochila porelloides, Plagiochila punctata, Plagiochila spinulosa, Ptilidium ciliare, Saccogyna viticulosa, Scapania gracilis, Scapania nemorea, Scapania umbrosa, Tritomaria exsectiformis, Tritomaria quinquedentata, Cladonia arbuscula, Cladonia chlorophaea, Cladonia digitata, Cladonia furcata, Cladonia impexa, Cladonia polydactyla, Cladonia squamosa, Cladonia squamules, Cladonia subcervicornis, Parmelia saxatilis, Sphaerophorus fragilis, Sphaerophorus globosus, Solidago virgaurea, Lonicera periclymenum, Succisa pratensis, Cornus suecica, Hypericum pulchrum, Teucrium scorodonia, Hyacinthoides non-scripta, Goodyera repens, Oxalis acetosella, Digitalis purpurea, Rumex acetosa, Lysimachia nemorum, Trientalis europaea, Anemone nemorosa, Potentilla erecta, Rubus fruticosus agg., Rubus idaeus, Galium saxatile, Melanpyrum pratense, Viola riviniana, Agrostis capillaris, Agrostis stolonifera, Agrostis vinealis, Anthoxanthum odoratum, Dactylis glomerata, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Holcus lanatus, Holcus mollis, Molinia caerulea, Poa nemoralis, Poa pratensis, Blechnum spicant, Pteridium aquilinum, Dryopteris aemula, Dryopteris borreri, Dryopteris dilatata, Dryopteris filix-mas, Hymenophyllum tunbrigense, Hymenophyllum wilsonii, Polypodium vulgare, Thelypteris limbosperma, Athyrium filix-femina

W11 — Altantic hazel wood, Atlantic oak wood, Caledonian forest, Upland birch wood, Wood pasture

Quercus petraea-Betula pubescens-Oxalis acetosella woodland

Matches 3 species from the description above: Betula pubescens, Ilex aquifolium, Quercus robur

Acer campestre, Ilex aquifolium, Betula pendula, Betula pubescens, Corylus avellana, Fagus sylvatica, Quercus hybrid, Quercus petraea, Quercus robur, Fraxinus excelsior, Larix decidua, Sorbus aucuparia, Calluna vulgaris, Erica cinerea, Juniperus communis, Vaccinium myrtillus, Cytisus scoparius, Crataegus monogyna, Rubus saxatilis, Carex pilulifera, Luzula campestris, Luzula multiflora, Luzula pilosa, Luzula sylvatica, Mnium hornum, Plagiomnium affine, Plagiomnium undulatum, Dicranum majus, Dicranum scoparium, Cirriphyllum piliferum, Eurhynchium striatum, Hylocomium splendens, Hypnum cupressiforme, Isothecium myosuroides, Kindbergia praelonga, Loeskeobryum brevirostre, Plagiothecium denticulatum, Plagiothecium undulatum, Pleurozium schreberi, Pseudoscleropodium purum, Rhytidiadelphus loreus, Rhytidiadelphus squarrosus, Rhytidiadelphus triquetrus, Thuidium tamariscinum, Atrichum undulatum, Polytrichum commune, Polytrichum formosum, Polytrichum longisetum, Sphagnum capillifolium, Diplophyllum albicans, Lophocolea bidentata, Plagiochila asplenioides, Plagiochila spinulosa, Angelica sylvestris, Conopodium majus, Campanula rotundifolia, Lonicera periclymenum, Succisa pratensis, Cerastium fontanum, Stellaria holostea, Pyrola minor, Vaccinium vitis-idaea, Lathyrus montanus, Geranium robertianum, Hypericum pulchrum, Ajuga reptans, Teucrium scorodonia, Convallaria majalis, Hyacinthoides non-scripta, Oxalis acetosella, Digitalis purpurea, Veronica chamaedrys, Veronica officinalis, Rumex acetosa, Lysimachia nemorum, Primula vulgaris, Trientalis europaea, Anemone nemorosa, Ranunculus acris, Ranunculus repens, Potentilla erecta, Rubus fruticosus agg., Rubus idaeus, Galium aparine, Galium saxatile, Melanpyrum pratense, Viola riviniana, Agrostis capillaris, Agrostis vinealis, Anthoxanthum odoratum, Brachypodium sylvaticum, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Festuca rubra, Holcus lanatus, Holcus mollis, Poa pratensis, Poa trivialis, Blechnum spicant, Pteridium aquilinum, Dryopteris borreri, Dryopteris dilatata, Dryopteris filix-mas, Thelypteris limbosperma, Athyrium filix-femina

W4 — Raised bog, Upland birch wood, Wet woodland

Betula pubescens-Molinia caerulea woodland

Matches 3 species from the description above: Betula pubescens, Ilex aquifolium, Quercus robur

Hedera helix, Salix aurita, Salix caprea, Salix cinerea, Salix pentandra, Ilex aquifolium, Betula pendula, Betula pubescens, Corylus avellana, Quercus hybrid, Quercus petraea, Quercus robur, Fraxinus excelsior, Pinus sylvestris, Sorbus aucuparia, Alnus glutinosa, Calluna vulgaris, Erica tetralix, Myrica gale, Vaccinium myrtillus, Vaccinium oxycoccos, Crataegus monogyna, Carex laevigata, Carex nigra, Carex rostrata, Eriophorum angustifolium, Eriophorum vaginatum, Juncus acutiflorus, Juncus effusus, Aulacomnium palustre, Mnium hornum, Orthodontium lineare, Pohlia nutans, Campylopus flexuosus, Dicranella heteromalla, Dicranum scoparium, Leucobryum glaucum, Brachythecium rutabulum, Calliergonell cuspidatum, Drepanocladus fluitans, Hypnum cupressiforme, Hypnum jutlandicum, Kindbergia praelonga, Plagiothecium denticulatum, Pleurozium schreberi, Pseudoscleropodium purum, Pseudotaxiphyllum elegans, Rhytidiadelphus squarrosus, Straminergon stramineum, Polytrichum commune, Polytrichum formosum, Sphagnum capillifolium, Sphagnum cuspidatum, Sphagnum fallax, Sphagnum fimbriatum, Sphagnum palustre, Sphagnum papillosum, Sphagnum squarrosum, Sphagnum subnitens, Calypogeia fissa, Chiloscyphus polyanthos, Lophocolea bidentata, Lophocolea heterophylla, Angelica sylvestris, Hydrocotyle vulgaris, Cirsium palustre, Lonicera periclymenum, Succisa pratensis, Valeriana officinalis, Equisetum fluviatile, Equisetum palustre, Lotus pedunculatus, Menyanthes trifoliata, Chamerion angustifolium, Epilobium palustre, Oxalis acetosella, Rumex acetosa, Comarum palustre, Filipendula ulmaria, Potentilla erecta, Rubus fruticosus agg., Galium palustre, Galium saxatile, Galium uliginosum, Viola palustris, Agrostis canina, Agrostis capillaris, Agrostis stolonifera, Anthoxanthum odoratum, Deschampsia cespitosa, Deschampsia flexuosa, Holcus lanatus, Holcus mollis, Molinia caerulea, Poa trivialis, Blechnum spicant, Pteridium aquilinum, Dryopteris carthusiana, Dryopteris cristata, Dryopteris dilatata, Athyrium filix-femina

A14 — Fast flowing river and stream

Myriophyllum alterniflorum community

Isolepis fluitans, Juncus bulbosus, Fontinalis antipyretica, Lobelia dortmanna, Equisetum fluviatile, Myriophyllum alterniflorum, Lemna minor, Callitriche stagnalis, Littorella uniflora, Potamogeton filiformis, Potamogeton gramineus, Potamogeton natans, Ranunculus peltatus, Chara spp., Nitella hyalina

A17 — Chalk river and stream, Fast flowing river and stream

Ranunculus penicillatus ssp. pseudofluitans community

Berula erecta, Nasturtium officinale, Elodea canadensis, Lemna minor, Callitriche stagnalis, Veronica beccabunga, Polygonum amphibium, Polygonum hydropiper, Potamogeton crispus, Potamogeton pectinatus, Ranunculus penicillatus ssp. pseudofluitans

A18 — Fast flowing river and stream

Ranunculus fluitans community

Fontinalis antipyretica, Fontinalis squamosa var. curnowii, Myriophyllum alterniflorum, Myriophyllum spicatum, Elodea canadensis, Mentha aquatica, Lemna gibba, Lemna minor, Potamogeton perfoliatus, Ranunculus fluitans, Glyceria fluitans, Phalaris arundinacea

A9 — Fast flowing river and stream, Marginal and inundation, Pond ditch and canal, Sluggish river and stream

Potamogeton natans community

Schoenoplectus lacustris, Juncus bulbosus, Sparganium angustifolium, Sparganium erectum, Sparganium minimum, Alisma plantago-aquatica, Lobelia dortmanna, Equisetum fluviatile, Myriophyllum alterniflorum, Elodea canadensis, Lemna minor, Lemna trisulca, Nymphaea alba, Callitriche platycarpa, Callitriche stagnalis, Littorella uniflora, Potamogeton natans, Ranunculus trichophyllus, Glyceria fluitans, Chara subspinosa