Mill Creek

Lassen National Forest · California · 7,587 acres · RoadlessArea Rule (2001)
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Observed Species (328)

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

(8)
Calochortus syntrophus
(1)
Atypoides gertschi
(1)
Gymnoconia peckiana
(1)
Sidalcea gigantea
(2)
Nostoc parmelioides
(2)
Brachycybe rosea
(1)
Brachycybe producta
Aleutian Maidenhair Fern (2)
Adiantum aleuticum
American Beaver (2)
Castor canadensis
American Bistort (1)
Bistorta bistortoides
American Black Bear (3)
Ursus americanus
American Dipper (4)
Cinclus mexicanus
American Goshawk (1)
Astur atricapillus
American Purple Vetch (1)
Vicia americana
American Robin (3)
Turdus migratorius
American Trailplant (2)
Adenocaulon bicolor
Bear Valley Buckwheat (4)
Eriogonum ursinum
Beavertail Mariposa Lily (1)
Calochortus coeruleus
Bigleaf Maple (14)
Acer macrophyllum
Bird's-foot Cliffbrake (18)
Pellaea mucronata
Bitter Cherry (1)
Prunus emarginata
Black Cottonwood (2)
Populus trichocarpa
Black-fruit Dogwood (8)
Cornus sessilis
Black-headed Grosbeak (1)
Pheucticus melanocephalus
Blue Field Gilia (4)
Gilia capitata
Blue-gray Gnatcatcher (1)
Polioptila caerulea
Bobcat (1)
Lynx rufus
Bracken Fern (3)
Pteridium aquilinum
Brewer's Rockcress (1)
Boechera breweri
Brewer's Wildmint (1)
Monardella breweri
Bridges' Triteleia (4)
Triteleia bridgesii
Bristly Haircap Moss (1)
Polytrichum piliferum
Brown Dogwood (1)
Cornus glabrata
Brown-headed Cowbird (1)
Molothrus ater
Bulbous Bluegrass (2)
Poa bulbosa
Bull Thistle (1)
Cirsium vulgare
Bush Beardtongue (2)
Keckiella lemmonii
California Antitrichia Moss (1)
Antitrichia californica
California Ash (1)
Fraxinus dipetala
California Black Oak (6)
Quercus kelloggii
California Blue-eyed-grass (2)
Sisyrinchium bellum
California Buckeye (4)
Aesculus californica
California Dutchman's-pipe (1)
Aristolochia californica
California Flattened Jumping Spider (2)
Platycryptus californicus
California Foothill Pine (4)
Pinus sabiniana
California Grape (3)
Vitis californica
California Harebell (3)
Smithiastrum prenanthoides
California Honeysuckle (1)
Lonicera hispidula
California Kingsnake (1)
Lampropeltis californiae
California Mountainmint (1)
Pycnanthemum californicum
California Pitcherplant (1)
Darlingtonia californica
California Quail (1)
Callipepla californica
California Red Fir (1)
Abies magnifica
California Rockrose (2)
Helianthella californica
California Skullcap (1)
Scutellaria californica
California Smilax (8)
Smilax californica
California Spikenard (1)
Aralia californica
California Stickseed (2)
Hackelia californica
California Torreya (23)
Torreya californica
California Yerba Santa (5)
Eriodictyon californicum
California common scorpion (1)
Paruroctonus silvestrii
Calyx-nose Monkeyflower (2)
Erythranthe nasuta
Canyon Live Oak (10)
Quercus chrysolepis
Canyon Liveforever (12)
Dudleya cymosa
Cascades Frog (1)
Rana cascadae
Cascara False Buckthorn (1)
Frangula purshiana
Chaparral Honeysuckle (4)
Lonicera interrupta
Cheatgrass (1)
Bromus tectorum
Chicory (1)
Cichorium intybus
Chilean Sweet-cicely (1)
Osmorhiza berteroi
Chinook Salmon (1)
Oncorhynchus tshawytscha
Chipping Sparrow (1)
Spizella passerina
Choke Cherry (1)
Prunus virginiana
Cliff Swallow (1)
Petrochelidon pyrrhonota
Coffee Fern (2)
Pellaea andromedifolia
Coleman's Rein Orchid (1)
Platanthera colemanii
Common Monkeyflower (1)
Erythranthe guttata
Common Pill-bug (1)
Armadillidium vulgare
Common Sagebrush Lizard (1)
Sceloporus graciosus
Common Wintergreen (5)
Chimaphila umbellata
Common Woolly-sunflower (4)
Eriophyllum lanatum
Common Yarrow (2)
Achillea millefolium
Coyote (2)
Canis latrans
Crevice Alumroot (2)
Heuchera micrantha
Dark-eyed Junco (5)
Junco hyemalis
Deerbrush (8)
Ceanothus integerrimus
Dense Lace Fern (3)
Aspidotis densa
Dimpled Specklebelly (1)
Lobaria anthraspis
Dog Vomit Slime Mold (1)
Fuligo septica
Douglas Juga (2)
Juga douglasi
Douglas Oak (1)
Quercus douglasii
Douglas' Squirrel (3)
Tamiasciurus douglasii
Douglas' Wormwood (2)
Artemisia douglasiana
Douglas-fir (3)
Pseudotsuga menziesii
Ensatina (2)
Ensatina eschscholtzii
Evergreen Blackberry (1)
Rubus laciniatus
Fall Thistle (7)
Cirsium occidentale
Few-flowered Oatgrass (2)
Danthonia unispicata
Fireweed (1)
Chamaenerion angustifolium
Fisher (1)
Pekania pennanti
Foothill Clover (1)
Trifolium ciliolatum
Fork-toothed Ookow (10)
Dichelostemma congestum
Fragrant Sumac (4)
Rhus aromatica
Fremont's Silktassel (1)
Garrya fremontii
Fringepod (1)
Thysanocarpus curvipes
Gaping Beardtongue (3)
Keckiella breviflora
Giant Chainfern (5)
Woodwardia fimbriata
Giant Helleborine (1)
Epipactis gigantea
Giant Rattlesnake-plantain (2)
Goodyera oblongifolia
Glandular Clarkia (2)
Clarkia arcuata
Goldback Fern (2)
Pentagramma triangularis
Golden Triteleia (1)
Triteleia ixioides
Golden-mantled Ground Squirrel (1)
Callospermophilus lateralis
Gophersnake (5)
Pituophis catenifer
Grassy Tarweed (1)
Madia gracilis
Greenleaf Manzanita (6)
Arctostaphylos patula
Hairy Curtain Crust (3)
Stereum hirsutum
Hairy Woodpecker (1)
Leuconotopicus villosus
Hairy-pink (1)
Petrorhagia dubia
Hall's Rupertia (2)
Rupertia hallii
Hansen's Spikemoss (1)
Selaginella hansenii
Hartweg's Wild Ginger (31)
Asarum hartwegii
Harvest Brodiaea (1)
Brodiaea elegans
Hooker's Mandarin (2)
Prosartes hookeri
Hummingbird-trumpet (1)
Epilobium canum
Incense Cedar (9)
Calocedrus decurrens
Indian Warrior (12)
Pedicularis densiflora
Ithuriel's Spear (1)
Triteleia laxa
Jepson's Monkeyflower (1)
Diplacus jepsonii
Kelley's Lily (1)
Lilium kelleyanum
Kellogg's Monkeyflower (2)
Diplacus kelloggii
Klamath Plum (2)
Prunus subcordata
Koch's Wolf Spider (1)
Alopecosa kochi
Lace Lipfern (7)
Myriopteris gracillima
Lanceleaf Springbeauty (2)
Claytonia lanceolata
Large-flower Collomia (2)
Collomia grandiflora
Large-flower Wire-lettuce (1)
Stephanomeria lactucina
Layne's Monkeyflower (5)
Diplacus layneae
Leafless wintergreen (5)
Pyrola aphylla
Leichtlin's Mariposa Lily (1)
Calochortus leichtlinii
Lemmon's Catchfly (2)
Silene lemmonii
Lesser Bladderwort (1)
Utricularia minor
Lewis' Mock Orange (7)
Philadelphus lewisii
Little Quaking Grass (1)
Briza minor
Lobb's Fiddleleaf (1)
Nama lobbii
Long-fruit Jewelflower (1)
Streptanthus longisiliquus
Long-tube Iris (7)
Iris tenuissima
Lovely Clarkia (5)
Clarkia concinna
Mahala-mat Ceanothus (6)
Ceanothus prostratus
Many-flower Snakelily (1)
Dichelostemma multiflorum
Many-stem Sedge (2)
Carex multicaulis
Marsh Claytonia (1)
Claytonia palustris
Marumleaf Buckwheat (1)
Eriogonum marifolium
Meadow Goat's-beard (1)
Tragopogon dubius
Mediterranean Mustard (1)
Hirschfeldia incana
Miner's-lettuce (2)
Claytonia perfoliata
Mountain Chickadee (2)
Poecile gambeli
Mountain Maple (3)
Acer glabrum
Mountain Whitethorn (1)
Ceanothus cordulatus
Mountain-mahogany (10)
Cercocarpus betuloides
Munite Prickly-poppy (1)
Argemone munita
Naked Buckwheat (2)
Eriogonum nudum
Naked Mariposa Lily (1)
Calochortus nudus
Narrowleaf Mule's-ears (2)
Wyethia angustifolia
Narrowleaf Owl's-clover (1)
Castilleja attenuata
Narrowleaf Swordfern (2)
Polystichum imbricans
New World Dyer's Polypore (1)
Phaeolus hispidoides
Newberry's Beardtongue (1)
Penstemon newberryi
Nodding Silverpuffs (1)
Microseris nutans
North American Racer (2)
Coluber constrictor
Northern Alligator Lizard (1)
Elgaria coerulea
Northern Flicker (2)
Colaptes auratus
Northern Spleenwort (2)
Asplenium septentrionale
Northern Yellow Warbler (1)
Setophaga aestiva
Northwestern Pond Turtle (1)
Actinemys marmorataProposed Threatened
Olive-sided Flycatcher (1)
Contopus cooperi
One-flower Bleedinghearts (1)
Dicentra uniflora
One-seed Pussy-paws (4)
Calyptridium monospermum
Orange Peel Fungus (1)
Aleuria aurantia
Orchard Grass (1)
Dactylis glomerata
Oregon Western Rosinweed (3)
Calycadenia truncata
Oregon White Oak (1)
Quercus garryana
Pacific Bleedingheart (1)
Dicentra formosa
Pacific Dogwood (19)
Cornus nuttallii
Pacific Mistletoe (1)
Phoradendron villosum
Pacific Ninebark (1)
Physocarpus capitatus
Pacific Stonecrop (17)
Sedum spathulifolium
Pacific Treefrog (5)
Pseudacris regilla
Panicled Willowherb (1)
Epilobium brachycarpum
Paper Onion (1)
Allium amplectens
Parish's Horse-nettle (1)
Solanum parishii
Pine Violet (1)
Viola pinetorum
Pine Violet (15)
Viola lobata
Pine Violet (6)
Viola purpurea
Pinemat Manzanita (2)
Arctostaphylos nevadensis
Pinewoods Lousewort (1)
Pedicularis semibarbata
Plume Moss (9)
Dendroalsia abietina
Poison ivy rust (1)
Pileolaria brevipes
Ponderosa Pine (6)
Pinus ponderosa
Pulsifer's Monkeyflower (1)
Erythranthe pulsiferae
Purple Black-snakeroot (1)
Sanicula bipinnatifida
Purple Fawnlily (1)
Erythronium purpurascens
Purple Milkweed (10)
Asclepias cordifolia
Purple Nightshade (1)
Solanum xanti
Purpus' Scorpionweed (1)
Phacelia purpusii
Raccoon (1)
Procyon lotor
Rayless Groundsel (1)
Senecio aronicoides
Red False Buckthorn (1)
Frangula rubra
Red Larkspur (8)
Delphinium nudicaule
Red-breasted Nuthatch (1)
Sitta canadensis
Rose Clover (2)
Trifolium hirtum
Rough Horsetail (2)
Equisetum hyemale
Rough-skinned Newt (1)
Taricha granulosa
Roughleaf Aster (1)
Eurybia radulina
Roundleaf Sundew (1)
Drosera rotundifolia
Rubber Rabbitbrush (1)
Ericameria nauseosa
Sacramento Cycladenia (3)
Cycladenia humilis
Salt Sedge (1)
Carex hassei
San Francisco Broomrape (2)
Aphyllon franciscanum
Scarlet Missionbells (17)
Fritillaria recurva
Scarlet Monkeyflower (2)
Erythranthe cardinalis
Scarlet Skyrocket (1)
Ipomopsis aggregata
Sedge-leaf Whitethorn (5)
Ceanothus cuneatus
Shelton's Violet (2)
Viola sheltonii
Shield-bract Monkeyflower (9)
Erythranthe glaucescens
Short-stem Russula (2)
Russula brevipes
Showy Milkweed (3)
Asclepias speciosa
Showy Tarweed (2)
Madia elegans
Sierra Chinquapin (3)
Chrysolepis sempervirens
Sierra Cliffbrake (3)
Pellaea brachyptera
Sierra Currant (1)
Ribes nevadense
Sierra Gartersnake (3)
Thamnophis couchii
Sierra Gooseberry (4)
Ribes roezlii
Sierra Jewelflower (1)
Streptanthus tortuosus
Sierra Lupine (4)
Lupinus grayi
Sierra Milkwort (2)
Rhinotropis cornuta
Sierra Nevada Peavine (3)
Lathyrus nevadensis
Sierra Newt (19)
Taricha sierrae
Sierra Sanicle (1)
Sanicula graveolens
Six-spotted Yellow Orbweaver (1)
Araniella displicata
Slender Clarkia (2)
Clarkia gracilis
Slender Cotton-grass (1)
Eriophorum gracile
Slender-stem Lessingia (1)
Lessingia nemaclada
Small-flowered Trefoil (1)
Acmispon parviflorus
Smooth Wild Rye (1)
Elymus glaucus
Snowplant (1)
Sarcodes sanguinea
Solomon's-plume (3)
Maianthemum racemosum
Sooty Grouse (1)
Dendragapus fuliginosus
Southern Alligator Lizard (7)
Elgaria multicarinata
Spearleaf False Dandelion (1)
Agoseris retrorsa
Spotted Coralroot (3)
Corallorhiza maculata
Spring Coccora (1)
Amanita vernicoccora
Steller's Jay (1)
Cyanocitta stelleri
Sticky Brown-stain Blue-eyed Mary (10)
Collinsia tinctoria
Sticky Gooseberry (1)
Ribes viscosissimum
Stream Trefoil (1)
Hosackia oblongifolia
Streambank Springbeauty (1)
Claytonia parviflora
Striped Racer (1)
Masticophis lateralis
Subarctic Ladyfern (1)
Athyrium filix-femina
Sugar Pine (1)
Pinus lambertiana
Sulphur Shelf (1)
Laetiporus gilbertsonii
Sunshine Amanita (1)
Amanita aprica
Tall White Bog Orchid (3)
Platanthera dilatata
Terrestrial Gartersnake (2)
Thamnophis elegans
Thimbleberry (4)
Rubus parviflorus
Three-ranked Thread Moss (1)
Meesia triquetra
Three-tooth Oceanspray (2)
Horkelia tridentata
Tobacco Ceanothus (1)
Ceanothus velutinus
Tongue Clarkia (5)
Clarkia rhomboidea
Toothed Wintergreen (1)
Pyrola dentata
Torrent Sedge (1)
Carex nudata
Torrey's Monkeyflower (3)
Diplacus torreyi
Tower-mustard (2)
Turritis glabra
Tuberous Skullcap (1)
Scutellaria tuberosa
Turkey Tail (2)
Trametes versicolor
Turpentine Wavewing (1)
Cymopterus terebinthinus
Umbellate Bastard Toad-flax (4)
Comandra umbellata
Umbrella Plant (19)
Darmera peltata
Valley Oakmoss Lichen (1)
Evernia prunastri
Variable-leaf Baby-blue-eyes (1)
Nemophila heterophylla
Varied-leaf Collomia (1)
Collomia heterophylla
Veiled Polypore (7)
Cryptoporus volvatus
Watercress (1)
Nasturtium officinale
Wavyleaf Soap-plant (1)
Chlorogalum pomeridianum
Western Azalea (1)
Rhododendron occidentale
Western Black Widow Spider (1)
Latrodectus hesperus
Western Black-legged Tick (2)
Ixodes pacificus
Western Bluebird (1)
Sialia mexicana
Western Buttercup (1)
Ranunculus occidentalis
Western Catchfly (2)
Silene occidentalis
Western Columbine (2)
Aquilegia formosa
Western Fence Lizard (4)
Sceloporus occidentalis
Western Forest Scorpion (10)
Uroctonus mordax
Western Gray Beardtongue (2)
Penstemon laetus
Western Hoptree (1)
Ptelea crenulata
Western Joepye-weed (3)
Ageratina occidentalis
Western Poison-oak (7)
Toxicodendron diversilobum
Western Rattlesnake (8)
Crotalus oreganus
Western Redbud (11)
Cercis occidentalis
Western Sweet-shrub (11)
Calycanthus occidentalis
Western Toad (1)
Anaxyrus boreas
Western Trillium (1)
Trillium ovatum
Western Wallflower (5)
Erysimum capitatum
Western Wood-Pewee (2)
Contopus sordidulus
White Fir (2)
Abies concolor
White Rushlily (2)
Hastingsia alba
White Triteleia (2)
Triteleia hyacinthina
White-flower Hawkweed (5)
Hieracium albiflorum
White-headed Woodpecker (1)
Leuconotopicus albolarvatus
White-stem Heron's-bill (1)
Erodium moschatum
Winecup Clarkia (1)
Clarkia purpurea
Wood Rose (1)
Rosa gymnocarpa
Woolly Mule's-ears (2)
Wyethia mollis
Yellow Pincushion (2)
Chaenactis glabriuscula
Yellow-and-white Monkeyflower (1)
Erythranthe bicolor
Yellow-staining Collomia (1)
Collomia tinctoria
Yellow-star Mariposa Lily (23)
Calochortus monophyllus
a bracket fungus (1)
Trichaptum abietinum
a fungus (4)
Taphrina occidentalis
a fungus (1)
Morchella tridentina
a fungus (1)
Mycena maculata
a fungus (1)
Rhodocollybia butyracea
a fungus (1)
Suillus fuscotomentosus
a terrestrial slug (5)
Ariolimax buttoni
blue dicks (5)
Dipterostemon capitatus
turkey mullein (1)
Croton setiger
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.

California Red-legged Frog
Rana draytoniiThreatened
California Condor
Gymnogyps californianusE, XN
California Spotted Owl
Strix occidentalis occidentalis
Gray Wolf
Canis lupus
Monarch
Danaus plexippusProposed Threatened
North American Wolverine
Gulo gulo luscus
Northwestern Pond Turtle
Actinemys marmorataProposed Threatened
Other Species of Concern (16)

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

American Dipper
Cinclus mexicanus
Black-throated Gray Warbler
Setophaga nigrescens
Bullock's Oriole
Icterus bullockii
California Thrasher
Toxostoma redivivum
Calliope Hummingbird
Selasphorus calliope
Cassin's Finch
Haemorhous cassinii
Channel Island Song Sparrow
Melospiza melodia graminea
Golden Eagle
Aquila chrysaetos
Hermit Warbler
Setophaga occidentalis
Lawrence's Goldfinch
Spinus lawrencei
Nuttall's Woodpecker
Dryobates nuttallii
Oak Titmouse
Baeolophus inornatus
Olive-sided Flycatcher
Contopus cooperi
Western Screech-Owl
Megascops kennicottii cardonensis
White-headed Woodpecker
Dryobates albolarvatus gravirostris
Wrentit
Chamaea fasciata
Migratory Birds of Conservation Concern (14)

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.

American Dipper
Cinclus mexicanus
Black-throated Gray Warbler
Setophaga nigrescens
Bullock's Oriole
Icterus bullockii
California Thrasher
Toxostoma redivivum
Calliope Hummingbird
Selasphorus calliope
Cassin's Finch
Haemorhous cassinii
Golden Eagle
Aquila chrysaetos
Hermit Warbler
Setophaga occidentalis
Lawrence's Goldfinch
Spinus lawrencei
Oak Titmouse
Baeolophus inornatus
Olive-sided Flycatcher
Contopus cooperi
Song Sparrow
Melospiza melodia
Western Screech-Owl
Megascops kennicottii
Wrentit
Chamaea fasciata
Vegetation (9)

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

California Mixed Conifer Forest
Tree / Conifer · 1,032 ha
GNR33.6%
California Mixed Conifer Forest
Tree / Conifer · 751 ha
GNR24.5%
California Foothill Mixed Oak Woodland
Tree / Hardwood · 414 ha
GNR13.5%
GNR7.1%
California Chaparral
Shrub / Shrubland · 203 ha
GNR6.6%
California Foothill Blue Oak Woodland
Tree / Conifer · 132 ha
GNR4.3%
California Ruderal Grassland and Meadow
Herb / Exotic Herbaceous · 57 ha
1.9%
Central California Coast Ranges Cliff and Canyon
Sparse / Sparsely Vegetated · 50 ha
1.6%
California Valley and Coastal Grassland
Herb / Grassland · 29 ha
GNR0.9%

Mill Creek

Mill Creek Roadless Area

Lassen National Forest, California · 7,587 acres