Natural Resources
Conservation Service
Ecological site F043AY583ID
Ashy Mountain Slopes
30-45" PZ Cryic
Clearwater Mountains
Last updated: 10/15/2020
Accessed: 06/29/2026
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Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.
MLRA notes
Major Land Resource Area (MLRA): 043A–Northern Rocky Mountains
Major Land Resource Area (MLRA): 043A–Northern Rocky Mountains
Description of MLRAs can be found in: United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land Resource Regions and Major Land Resource Areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296.
Available electronically at: http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_053624#handbookLRU notes
Most commonly found in LRU 43A10 (Clearwater Mountains). Also found in areas of 43A11 (Bitterroot Metasedimentary Zone). Climate parameters were obtained from PRISM and other models for the area. Landscape descriptors are estimated from USGS DEM products and their derivatives.
Classification relationships
Relationship to Other Established Classifications:
United States National Vegetation Classification (2008) – A3614 Abies lasiocarpa – Picea engelmannii Rocky Mountain Forest & Woodland Alliance
Washington Natural Heritage Program. Ecosystems of Washington State, A Guide to Identification, Rocchio and Crawford, 2015 – Subalpine – Montane Mesic Forest
Description of Ecoregions of the United States, USFS PN # 1391, 1995 - M333 Northern Rocky Mt. Forest-Steppe-Coniferous Forest-Alpine Meadow Province
Level III and IV Ecoregions of WA, US EPA, June 2010 – 15r Okanogan-Colville Xeric Valleys and Foothills, 15w Western Selkirk Maritime Forest, 15x Okanogan Highland Dry Forest, 15y Selkirk Mountains.
This ecological site includes the following USDA Forest Service Plant Associations: Abies lasiocarpa Series; ABLA/MEFE and ABLA/XETE Habitat Types and Tsuga mertensiana Series; TSME/MEFE and TSME/XETE Habitat Types. (Cooper et al., 1987)Ecological site concept
This ESD in distinguished by an overstory of subalpine fir or mountain hemlock and an understory shrub component of menzesia and huckleberry. On some exposures shrubs are absent and beargrass dominates the understory. It occurs on upper slopes of mountainsides, and ridges. These soils have developed in thick (>7 inches) Mazama tephra deposits over local till or residuum and colluvium from granitic and metamorphic rock. The soils range from moderately deep to very deep and have adequate available water capacity to a depth of 40 inches. The soils are moderately well or well-drained. Water tables, when present, are perched and >30 inches below the surface during May-Oct. This ESD fits into the National Vegetation Classification’s Subalpine Fir - Engelmann Spruce Rocky Mountain Moist Forest Alliance and Washington State Natural Heritage Program’s Rocky Mountain Subalpine Mesic-Wet Spruce-Fir Forest.
Table 1. Dominant plant species
Tree (1) Abies lasiocarpa
(2) Tsuga mertensianaShrub (1) Menziesia ferruginea
(2) Vaccinium membranaceumHerbaceous (1) Xerophyllum tenax
(2) Goodyera oblongifoliaPhysiographic features
Physiographic Features
Landscapes: Mountains,
Landform: mountain slopes, ridges, glacial-valley walls
Elevation (m): Total range = 1185 to 2185 m
(3,850 to 7,165 feet)
Central tendency = 1560 to 1810 m
(5,115 to 5,935 feet)
Slope (percent): Total range = 0 to 85 percent
Central tendency = 25 to 50 percent
Aspect: none dominantTable 2. Representative physiographic features
Landforms (1) Mountains > Mountain slope
(2) Mountains > Ridge
(3) Mountains > Glacial-valley wall
(4) Mountains > Glacial-valley floor
Flooding frequency None Ponding frequency None Elevation 5115 – 5935 ft Slope 25 – 50 % Water table depth 80 in Aspect Aspect is not a significant factor Table 3. Representative physiographic features (actual ranges)
Flooding frequency None Ponding frequency None Elevation 3850 – 7165 ft Slope 0 – 85 % Water table depth 35 – 80 in Climatic features
Climatic Features
Frost-free period (days): Total range = 35 to 105 days
Central tendency = 40 to 65 days
Mean annual precipitation (cm): Total range = 780 to 2235 mm
(31 to 88 inches)
Central tendency = 1325 to 1690 mm
(52 to 67 inches)
MAAT (C): Total range = 4.4 to 6.8
(40 to 44 F)
Central tendency = 3.8 to 5.0
(39 to 41 F)
Climate Stations: none">Influencing water features
Water Table Depth: 35 to >80 inches during Mar-Jun (median= >80 inches)<br />
<br />
Flooding: <br />
Frequency: None <br />
Duration: None<br />
<br />
Ponding: <br />
Frequency: None <br />
Duration: NoneSoil features
Representative Soil Features
This ecological site is associated with several soil components (e.g. Andic Cryochrepts, McCay, Redraven, Typic Haplocryands, Rubycreek, Daveggio, Katka, Fico, Vay, and Roman). The soil components can be grouped into: Andic Haplocryepts, Typic Haplocryands, Andic Dystrocryepts, Typic Fulvicryands, Typic Vitricryands, and Vitric Haplocryands. These soils have developed in thick (>7 inches) Mazama tephra deposits over local till or residuum and colluvium from granitic and metamorphic rock. The soils range from moderately deep to very deep and have adequate available water capacity to a depth of 40 inches. The soils are moderately well or well-drained. Water tables, when present, are perched and >30 inches below the surface during May-Oct
Fragment content of surface: 0 to 20 percent (median = 0%)
Content FragmentsTable 4. Representative soil features
Parent material (1) Volcanic ash
(2) Till
(3) Colluvium – granite
(4) Colluvium – metamorphic rock
(5) Residuum – granite
(6) Residuum – metamorphic rock
Surface texture (1) Medial silt loam
(2) Gravelly, medial loam
(3) Medial loam
Drainage class Well drained Permeability class Moderate Depth to restrictive layer 80 in Soil depth 80 in Surface fragment cover >3" Not specified Available water capacity
(0-40in)5.3 in Calcium carbonate equivalent
(0-60in)Not specified Electrical conductivity
(0-60in)Not specified Soil reaction (1:1 water)
(0-60in)5.8 Subsurface fragment volume <=3"
(10-60in)10 % Subsurface fragment volume >3"
(10-60in)10 % Table 5. Representative soil features (actual values)
Drainage class Moderately well drained to well drained Permeability class Slow to moderate Depth to restrictive layer 20 – 80 in Soil depth 20 – 80 in Surface fragment cover >3" 0 – 3 % Available water capacity
(0-40in)3.3 – 5.7 in Calcium carbonate equivalent
(0-60in)0 % Electrical conductivity
(0-60in)0 mmhos/cm Soil reaction (1:1 water)
(0-60in)5.1 – 7.3 Subsurface fragment volume <=3"
(10-60in)5 – 60 % Subsurface fragment volume >3"
(10-60in)0 – 61 % Ecological dynamics
Ecological Dynamics of the Site
The four main US Forest Service habitat types (HT) incorporated into this ecological site all are located high elevation mountain slopes and ridges. They can occur at lower elevations as ecotypes of their higher elevation sites due to cold air drainage and/or frosty conditions. The ABLA/MEFE (Subalpine fir/rustyleaf menzesia) and TSME/MEFE (Mountain hemlock/rustyleaf menzesia) HTs are moister than ABLA/XETE (ABLA/beargrass) or TSME/XETE (Mountain hemlock/beargrass) and capable of having more Engelmann spruce in the overstory and understory. In the ABLA/XETE and TSME/XETE HTs, subalpine fir will have higher presence in the overstory and understory with fire exclusion. Some stands are in early to mid-seral condition with Douglas-fir (PSME), western larch (LAOC), and lodgepole pine (PICO) as the main overstory component. Subalpine fir (ABLA), Mountain hemlock (TSME) and/or Engelmann spruce (PIEN) can be present in the understory. Historically western white pine (PIMO3) played an important role as a seral species.State and transition model
Custom diagramStandard diagram
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More interactive model formats are also available. View Interactive Models
Click on state and transition labels to scroll to the respective textEcosystem states
State 1 submodel, plant communities
State 1
ReferenceMoist sites have substantial shrub cover, and often have a closed canopy. Climax stands are dominated by subalpine fir and mountain hemlock. Large spruces persist for centuries in old-growth stands. A variety of species, including climax species and spruce, occur in early succession. Seral lodgepole pine can dominate in several habitat types, but it dies out 120 to 160 years after stand establishment. Western larch is common on sites with good drainage.
Community 1.1
ReferenceOverstory dominated by subalpine fir, Engelmann spruce and/or mountain hemlock. Where fire or site conditions have kept stands more open western larch, Douglas-fir, and lodgepole pine may be present. Understory will have subalpine fir, mountain hemlock, and Engelmann spruce where ground fires have been absent. Understory dominated by shrubs with sparse forbs.
Dominant plant species
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subalpine fir (Abies lasiocarpa), tree
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mountain hemlock (Tsuga mertensiana), tree
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Engelmann spruce (Picea engelmannii), tree
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lodgepole pine (Pinus contorta var. latifolia), tree
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thinleaf huckleberry (Vaccinium membranaceum), shrub
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rusty menziesia (Menziesia ferruginea), shrub
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grouse whortleberry (Vaccinium scoparium), shrub
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Hitchcock's smooth woodrush (Luzula glabrata var. hitchcockii), grass
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common beargrass (Xerophyllum tenax), other herbaceous
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darkwoods violet (Viola orbiculata), other herbaceous
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western rattlesnake plantain (Goodyera oblongifolia), other herbaceous
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pipsissewa (Chimaphila umbellata), other herbaceous
Community 1.2
Stand Initiation, Shrub/Herb PhaseStand replacing fires convert site back to shrub/herb phase with tree regeneration dependent on seed source and fire severity. Dense stands of lodgepole pine can be present if sufficient seed was available in the ground. Western larch can also establish quickly with sufficient seed source and bare soil. Mixed species stand could develop with all seral species present including Douglas-fir, larch, and lodgepole. Shrubs will re-sprout and compete with tree seedlings.
Community 1.3
Stem ExclusionDense stands of mixed or single tree species will develop and start to compete for space and nutrients.
Community 1.4
Understory Re-initiationAs stands mature mortality gaps occur from stand competition and insects create areas for understory release. Shrubs and herbs increase along with tree regeneration.
Pathway 1.1A
Community 1.1 to 1.2Stand replacing fire moving site back to the shrub/herb phase.
Pathway 1.2A
Community 1.2 to 1.3Time. Mixed or single seral species tree regeneration move out of the seedling/sapling phase into dense pole stands.
Pathway 1.3B
Community 1.3 to 1.2Stand replacing fire back to the shrub/herb phase.
Pathway 1.3A
Community 1.3 to 1.4Stands move out of the pole stage through competition opening up canopy gaps for understory shrubs and herbs to increase. Tree regeneration will include shade tolerant subalpine fir and Engelmann spruce.
Pathway 1.4A
Community 1.4 to 1.1Stands mature into mixed stand of seral species with some subalpine fir, mountain hemlock or Engelmann spruce in overstory and understory.
Pathway 1.4B
Community 1.4 to 1.2Stand replacing fire converts site back to the shrub/herb phase
State 2
Fire ExclusionLack of fire allows shade tolerant species (subalpine fir, mountain hemlock) to dominate site. Scattered large individuals of Engelmann spruce may persist in stand. Shrubs include fools huckleberry, and blue huckleberry. Forbs include queencup beadlily, rattlesnake plantain, western meadowrue and beargrass. Shrubs such as fools huckleberry and blue huckleberry will increase in absence of fire.
State 3
Lodgepole PineLodgepole seedlings dominate stand soon after fire. When the prefire stand supported pines with serotinous cones, lodgepole pine seedlings often germinate in profusion the year after fire, with densities exceeding 10,000 per acre. When the prefire stand supported pines bearing mainly nonserotinous cones, restocking is slower. Douglas-fir regeneration is common on relatively warm sites. Engelmann spruce and subalpine fir also occur, but competition and shade from lodgepole seedlings suppress these species. Where fire return frequency is ~150 years PICO has potential to dominate reproduction and stand composition through several fire cycles.
Transition T1A
State 1 to 2Fire exclusion for long time periods will lead to an overstory of subalpine fir or mountain hemlock and Engelmann spruce with both species also in the understory. On the moister sites Engelmann spruce will be more prominent.
Transition T1B
State 1 to 3Stand replacing fir recurs over an interval <150 years. PICO is present as seed source in stand and successfully dominates regeneration.
Restoration pathway R2A
State 2 to 1Overstory management and prescribed fire to increase seral species establishment.
Restoration pathway R3A
State 3 to 1Overstory management and fire suppression to increase species diversity
Additional community tables
Table 6. Community 1.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 7. Community 1.2 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 8. Community 1.3 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 9. Community 1.4 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Interpretations
Supporting information
References
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Cooper, S.V., K.E. Neiman, R. Steele, and D.W. Roberts. 1991. Forest Habitat types of Northern Idaho, A Second Approximation.
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Finklin, A.I. 1983. Climate of Priest River Experimental Forest, northern Idaho. Gen. Tech. Rep. INT-159. U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, Ogden, UT. 53.
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Smith and Fischer. 1997. Fire Ecology of the Forest Habitat Types of Northern Idaho.
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Williams, C.K., B.F. Kelley, B.G. Smith, and T.R. Lillybridge. October, 1995. Forested Plant Associations of the Colville National Forest.
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Williams, C.K. and T.R. Lillybridge. 1983. Forested Plant Associations of the Okanogan National Forest
R6-Ecol-132b-1983.
Approval
Curtis Talbot, 10/15/2020
Rangeland health reference sheet
Interpreting Indicators of Rangeland Health is a qualitative assessment protocol used to determine ecosystem condition based on benchmark characteristics described in the Reference Sheet. A suite of 17 (or more) indicators are typically considered in an assessment. The ecological site(s) representative of an assessment location must be known prior to applying the protocol and must be verified based on soils and climate. Current plant community cannot be used to identify the ecological site.
Author(s)/participant(s) Contact for lead author Date 06/29/2026 Approved by Approval date Composition (Indicators 10 and 12) based on Annual Production Indicators
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Number and extent of rills:
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Presence of water flow patterns:
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Number and height of erosional pedestals or terracettes:
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Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
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Number of gullies and erosion associated with gullies:
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Extent of wind scoured, blowouts and/or depositional areas:
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Amount of litter movement (describe size and distance expected to travel):
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Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
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Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
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Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
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Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
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Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):
Dominant:
Sub-dominant:
Other:
Additional:
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Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
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Average percent litter cover (%) and depth ( in):
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Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
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Potential invasive (including noxious) species (native and non-native). List species which BOTH characterize degraded states and have the potential to become a dominant or co-dominant species on the ecological site if their future establishment and growth is not actively controlled by management interventions. Species that become dominant for only one to several years (e.g., short-term response to drought or wildfire) are not invasive plants. Note that unlike other indicators, we are describing what is NOT expected in the reference state for the ecological site:
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Perennial plant reproductive capability:
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