Roadless Areas
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Great Basin & Intermountain Introduced Annual Grassland

EVT 9308
HerbExotic herbaceous
Roadless Areas (78)

Inventoried Roadless Areas where this ecosystem is present, identified from LANDFIRE 2024 Existing Vegetation Type spatial analysis. Coverage indicates the proportion of each area occupied by this ecosystem type.

California (12)

AreaForestCoverageHectares
Callahan FlowKlamath National Forest11.7%153.09
Adams PeakPlumas National Forest8.0%171.54
LavasModoc National Forest5.7%592.92
SinkardHumboldt-Toiyabe National Forest4.6%37.62
Callahan FlowModoc National Forest4.3%115.92
Iceberg - SlinkardHumboldt-Toiyabe National Forest4.3%26.91
Dobie FlatModoc National Forest3.9%239.58
Steele SwampModoc National Forest3.2%244.98
Wild Horse Mtn. (CA)Humboldt-Toiyabe National Forest2.1%246.06
Big CanyonModoc National Forest1.2%33.03
Mt. JacksonHumboldt-Toiyabe National Forest0.6%48.33
Boundary Peak (CA)Inyo National Forest0.2%212.13

Nevada (34)

AreaForestCoverageHectares
Rose - Hunter WestHumboldt-Toiyabe National Forest51.0%16.74
Humboldt - North Fk.Humboldt-Toiyabe National Forest44.5%25.11
Rose - Hunter EastHumboldt-Toiyabe National Forest43.9%9.63
Ruby - Box CanyonHumboldt-Toiyabe National Forest16.7%17.73
Rose - VerdiHumboldt-Toiyabe National Forest14.0%65.52
Rose - EvansHumboldt-Toiyabe National Forest12.6%243.45
Humboldt - 2nd BoulderHumboldt-Toiyabe National Forest10.5%9.72
Rose - Alum CreekHumboldt-Toiyabe National Forest9.9%34.11
Ruby - MarshHumboldt-Toiyabe National Forest7.5%310.32
Sherman PeakHumboldt-Toiyabe National Forest7.3%191.34
Ruby - ThompsonHumboldt-Toiyabe National Forest7.2%154.98
Humboldt - RockwallHumboldt-Toiyabe National Forest6.1%4.59
Humboldt - WisemanHumboldt-Toiyabe National Forest5.8%10.71
SugarloafInyo National Forest3.4%159.39
Pearl PeakHumboldt-Toiyabe National Forest3.1%909
Humboldt - SouthHumboldt-Toiyabe National Forest3.1%140.13
Marble FallsHumboldt-Toiyabe National Forest2.5%49.95
Ruby - SouthHumboldt-Toiyabe National Forest2.3%124.56
Devils Gate (NV)Humboldt-Toiyabe National Forest2.1%62.46
Ruby - SegundaHumboldt-Toiyabe National Forest2.0%99.27
Ruby - Secret Pk.Humboldt-Toiyabe National Forest1.8%49.14
Circle WashHumboldt-Toiyabe National Forest1.8%62.28
South Fork QuinnHumboldt-Toiyabe National Forest1.5%250.11
Hot Springs ButteHumboldt-Toiyabe National Forest1.3%40.68
Ruby - Smith CkHumboldt-Toiyabe National Forest1.3%39.51
LampsonHumboldt-Toiyabe National Forest1.3%54.81
Wellington HillsHumboldt-Toiyabe National Forest1.1%90.45
ShellbackHumboldt-Toiyabe National Forest1.0%151.74
Rock CanyonHumboldt-Toiyabe National Forest0.9%111.6
Santa RosaHumboldt-Toiyabe National Forest0.8%186.48
Ruby - Lamoille CynHumboldt-Toiyabe National Forest0.7%88.83
Boundary Peak (NV)Inyo National Forest0.5%47.43
Bald Mtn.Humboldt-Toiyabe National Forest0.5%89.55
Georges CanyonHumboldt-Toiyabe National Forest0.4%164.61

Oregon (3)

AreaForestCoverageHectares
Lord Flat Somers PointWallowa-Whitman National Forest1.4%396.09
North Fork MalheurMalheur National Forest0.8%61.74
Imnaha FaceWallowa-Whitman National Forest0.5%64.53

Utah (28)

AreaForestCoverageHectares
CopleysFishlake National Forest3.5%167.22
Stansbury MountainsWasatch-Cache National Forest2.9%473.13
Mt. Logan WestWasatch-Cache National Forest2.6%54.72
Burch CreekWasatch-Cache National Forest2.4%67.77
Cedar BenchDixie National Forest1.9%67.23
Oak CreekFishlake National Forest1.8%402.12
418011Uinta National Forest1.8%96.39
South FrancisWasatch-Cache National Forest1.7%23.85
Lewis PeakWasatch-Cache National Forest1.5%69.84
WillardWasatch-Cache National Forest1.4%104.67
418025Uinta National Forest1.3%170.73
418006Uinta National Forest1.3%61.11
Mt. AireWasatch-Cache National Forest1.3%49.59
Black MountainManti-Lasal National Forest1.2%32.31
Mt. Logan SouthWasatch-Cache National Forest1.1%76.86
418044Uinta National Forest1.1%24.3
Mt. NaomiWasatch-Cache National Forest1.1%179.01
PavantFishlake National Forest1.0%173.52
418012Uinta National Forest1.0%102.15
Mt. Logan NorthWasatch-Cache National Forest1.0%74.52
FarmingtonWasatch-Cache National Forest0.9%39.6
418024Uinta National Forest0.9%178.65
418022Uinta National Forest0.8%58.59
418027Uinta National Forest0.8%46.8
Mahogany RangeWasatch-Cache National Forest0.7%34.11
418029Uinta National Forest0.7%45.27
SanpitchManti-Lasal National Forest0.5%54.63
418016Uinta National Forest0.4%63.45

Washington (1)

AreaForestCoverageHectares
Wodouglas Adj.Wenatchee National Forest0.7%48.96
Methodology and Data Sources

Ecosystem classification: Ecosystems are classified using the LANDFIRE 2024 Existing Vegetation Type (EVT) layer, mapped to NatureServe Terrestrial Ecological Systems via a curated crosswalk. Each EVT is linked to the USNVC (U.S. National Vegetation Classification) hierarchy through pixel-level co-occurrence analysis of LANDFIRE EVT and NatureServe IVC Group rasters across all roadless areas.

Vegetation coverage: Coverage percentages and hectares are derived from zonal statistics of the LANDFIRE 2024 EVT raster intersected with roadless area boundaries.

Ecosystem narratives and community species: Sourced from the NatureServe Explorer API, representing professional ecological assessments of vegetation composition, environmental setting, dynamics, threats, and characteristic species assemblages.

IVC hierarchy: The International Vegetation Classification hierarchy is sourced from the USNVC v3.0 Catalog, providing the full classification from Biome through Association levels.

Component associations: Plant community associations listed as components of each NatureServe Ecological System. Association data from the NatureServe Explorer API.

State ranks: Conservation status ranks assigned by NatureServe member programs in each state where the ecosystem occurs.