Twin Sisters

Colville National Forest · Washington · 13,051 acres · RoadlessArea Rule (2001)
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Observed Species (40)

Species with confirmed research-grade observation records from iNaturalist community science data.

Whitebark Pine (2)
Pinus albicaulisThreatened
American Trailplant (1)
Adenocaulon bicolor
Bearberry (1)
Arctostaphylos uva-ursi
Big Sagebrush (1)
Artemisia tridentata
Bracken Fern (1)
Pteridium aquilinum
Carolina Tassel-rue (1)
Trautvetteria caroliniensis
Columbian Ground Squirrel (1)
Urocitellus columbianus
Columbian Monkshood (1)
Aconitum columbianum
Common Wintergreen (1)
Chimaphila umbellata
Common Yarrow (2)
Achillea millefolium
Curve-beak Lousewort (2)
Pedicularis contorta
Dwarf Waterleaf (1)
Hydrophyllum capitatum
Engelmann Spruce (1)
Picea engelmannii
Entireleaf Ragwort (1)
Senecio integerrimus
Fairy Slipper (1)
Calypso bulbosa
Fescue Sandwort (1)
Eremogone capillaris
Fireweed (1)
Chamaenerion angustifolium
Ground Juniper (3)
Juniperus communis
Heartleaf Arnica (1)
Arnica cordifolia
Lanceleaf Springbeauty (1)
Claytonia lanceolata
Lanceleaf Stonecrop (3)
Sedum lanceolatum
Marsh Valerian (1)
Valeriana sitchensis
North American Red Squirrel (1)
Tamiasciurus hudsonicus
Oregon Boxleaf (1)
Paxistima myrsinites
Pearly Everlasting (2)
Anaphalis margaritacea
Pine Reedgrass (1)
Calamagrostis rubescens
Red Clover (1)
Trifolium pratense
Sagebrush Buttercup (1)
Ranunculus glaberrimus
Single-flowered Clintonia (1)
Clintonia uniflora
Subalpine Fir (1)
Abies lasiocarpa
Subalpine Fleabane (2)
Erigeron glacialis
Sulphur-flower Buckwheat (3)
Eriogonum umbellatum
Tall White Bog Orchid (1)
Platanthera dilatata
Thimbleberry (1)
Rubus parviflorus
Virginia Strawberry (1)
Fragaria virginiana
Yellow Beardtongue (1)
Penstemon confertus
Yellow Columbine (1)
Aquilegia flavescens
a fungus (1)
Alloclavaria purpurea
a fungus (1)
Auricularia americana
Federally Listed Species (7)

Species identified by the U.S. Fish and Wildlife Service as potentially occurring within this area based on range and habitat data. These designations do not indicate confirmed presence — they identify habitat where agency actions may require consultation under the Endangered Species Act.

Whitebark Pine
Pinus albicaulisThreatened
Bull Trout
Salvelinus confluentus
Canada Lynx
Lynx canadensis
Monarch
Danaus plexippusProposed Threatened
North American Wolverine
Gulo gulo luscus
Suckley's Cuckoo Bumble Bee
Bombus suckleyiProposed Endangered
Yellow-billed Cuckoo
Coccyzus americanus
Other Species of Concern (5)

Species identified by the U.S. Fish and Wildlife Service as potentially occurring based on range and habitat data.

Bald Eagle
Haliaeetus leucocephalus
Calliope Hummingbird
Selasphorus calliope
Cassin's Finch
Haemorhous cassinii
Olive-sided Flycatcher
Contopus cooperi
Rufous Hummingbird
Selasphorus rufus
Migratory Birds of Conservation Concern (5)

Birds of conservation concern identified by the U.S. Fish and Wildlife Service as potentially occurring based on range data. These species may warrant additional consideration under the Migratory Bird Treaty Act.

Bald Eagle
Haliaeetus leucocephalus
Calliope Hummingbird
Selasphorus calliope
Cassin's Finch
Haemorhous cassinii
Olive-sided Flycatcher
Contopus cooperi
Rufous Hummingbird
Selasphorus rufus
Vegetation (8)

Composition from LANDFIRE 2024 EVT spatial analysis. Ecosystems classified per NatureServe Terrestrial Ecological Systems.

Southern Rockies Mixed Conifer Forest
Tree / Conifer · 2,871 ha
GNR54.4%
GNR17.5%
Rocky Mountain Lodgepole Pine Forest
Tree / Conifer · 681 ha
GNR12.9%
GNR5.1%
Southern Rockies Mixed Conifer Forest
Tree / Conifer · 184 ha
GNR3.5%
Northern Rockies Foothill Shrubland
Shrub / Shrubland · 150 ha
GNR2.8%
Northern Rockies Subalpine Grassland
Herb / Grassland · 83 ha
GNR1.6%
GNR1.0%

Twin Sisters

Twin Sisters Roadless Area

Colville National Forest, Washington · 13,051 acres