Natural Resources
Conservation Service
Major Land Resource Area 115X
Major Land Resource Area
Accessed: 04/29/2026
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2
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Next, learn more about the selected ecological site and its characteristic dynamics by browsing the ecological site description and exploring alternative state and transition model formats.
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Zoom in to display soil survey map units for an area of interest, and zoom out to display MLRAs. Select a map unit polygon to view ecological sites correlated to that map unit. View a brief description of an ecological site by clicking on its name in the map popup. Soil survey correlations may not be accurate, and ecological site classification of a location should always be verified in the field. Each selection may require the transfer of several hundred KB of data.
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Ecological sites
Major Land Resource Areas
Ecological site photos
Tools
Filter by
interactive key
precipitation
frost free days
more..
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Type
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Filters
Interactive key
Precipitation
Frost free days
Elevation
Slope
Landform
Parent material origin
Parent material kind
Soil texture
Uplands
Dunes
Terraces/Lakeplains
Floodplains
Slopes <18%
Slopes >18%
No depth restrictions
Depth restrictions
Moderately well drained and well drained
F115XA001IL – Silty Upland
F115XA001IL – Silty Upland
Somewhat Poorly drained to Poorly drained
F115XA003IL – Wet Silty Upland
F115XA003IL – Wet Silty Upland
Fragipan
F115XA004IL – Fragic Upland
F115XA004IL – Fragic Upland
No depth restrictions (very deep)
F115XA002IL – Silty Backslope
F115XA002IL – Silty Backslope
Depth restrictions (deep to moderately deep)
F115XA005IL – Bedrock Backslope
F115XA005IL – Bedrock Backslope
Somewhat poorly drained to poorly drained
R115XA101IL – Wet Sand Dunes
R115XA101IL – Wet Sand Dunes
Well Drained
R115XA103IL – Sand Dunes
R115XA103IL – Sand Dunes
Somewhat excessively drained to excessively drained
R115XA102IL – Dry Sand Dunes
R115XA102IL – Dry Sand Dunes
Mineral
Organic
Somewhat poorly drained to very poorly drained
Moderately well drained to well drained
Clayey
F115XA007IL – Wet Clayey Terrace
F115XA007IL – Wet Clayey Terrace
Sandy
R115XA105IL – Wet Sandy Terrace
R115XA105IL – Wet Sandy Terrace
Loamy
F115XA011IL – Wet Loamy Terrace
F115XA011IL – Wet Loamy Terrace
No fragipan
Fragipan -not described at this time
Clayey
F115XA006IL – Clayey Terrace
F115XA006IL – Clayey Terrace
Sandy
R115XA104IL – Sandy Terrace
R115XA104IL – Sandy Terrace
Loamy
Slope <10%
F115XA008IL – Loamy Terrace
F115XA008IL – Loamy Terrace
Slope >10%
F115XA010IL – Loamy Backslope Terrace
F115XA010IL – Loamy Backslope Terrace
Very poorly drained
R115XA106IL – Marsh
R115XA106IL – Marsh
Textural family - fine
Textural family - course silty to fine silty
Textural family -course Loamy
F115XA015IL – Loamy Floodplain
F115XA015IL – Loamy Floodplain
Textural family - sandy
F115XA017IL – Sandy Floodplain
F115XA017IL – Sandy Floodplain
Moderately well drained
F115XA012IL – Clayey Floodplain
F115XA012IL – Clayey Floodplain
Poorly drained to very poorly drained
F115XA018IL – Wet Clayey Floodplain
F115XA018IL – Wet Clayey Floodplain
Somewhat poorly drained
F115XA014IL – Wet Silty Floodplain
F115XA014IL – Wet Silty Floodplain
Moderately well drained to well drained
F115XA013IL – Silty Floodplain
F115XA013IL – Silty Floodplain
Very poorly drained
F115XA016IL – Wet Muck
F115XA016IL – Wet Muck
Upland Summits, Shoulders or Backslopes
Upland Drainageways
High Terrace
F115XB022MO – Loess High Terrace Forest
F115XB022MO – Loess High Terrace Forest
Footslope
F115XB023MO – Wet Footslope Forest
F115XB023MO – Wet Footslope Forest
Low Terraces and Floodplain Steps
VI. Floodplains (occasional to frequent flooding)
Bedrock < 20”
Bedrock > 20”
Steep slope dominant (upper slope range to 70%)
Steep slope minor
North, East aspects
R115XB018MO – Limestone/Dolomite Protected Cliff
R115XB018MO – Limestone/Dolomite Protected Cliff
South, West aspects
R115XB019MO – Limestone/Dolomite Exposed Cliff
R115XB019MO – Limestone/Dolomite Exposed Cliff
Limestone/Dolomite residuum
R115XB009MO – Shallow Limestone/Dolomite Upland Glade/Woodland
R115XB009MO – Shallow Limestone/Dolomite Upland Glade/Woodland
Sandstone residuum
R115XB052MO – Shallow Sandstone Backslope Glade/Woodland
R115XB052MO – Shallow Sandstone Backslope Glade/Woodland
<15% slope
>15% slope
Loess >40”
Loess >12” and <40”
Little or no loess (<12”)
HAHT (Human altered/human transported) material
F115XB061MO – Anthropic Deep Loess Upland
F115XB061MO – Anthropic Deep Loess Upland
No HAHT (Human altered/human transported) )material
F115XB001MO – Deep Loess Upland Woodland
F115XB001MO – Deep Loess Upland Woodland
Pedisediment/till substratum
F115XB004MO – Loess Upland Woodland
F115XB004MO – Loess Upland Woodland
Residuum substratum
F115XB005MO – Loamy Upland Woodland
F115XB005MO – Loamy Upland Woodland
Dolomite/Limestone residuum
Sandstone residuum
F115XB016MO – Sandstone Upland Woodland
F115XB016MO – Sandstone Upland Woodland
Silt loam surface; not skeletal
F115XB007MO – Loamy Limestone/Dolomite Upland Woodland
F115XB007MO – Loamy Limestone/Dolomite Upland Woodland
Skeletal to surface
F115XB013MO – Chert Upland Woodland
F115XB013MO – Chert Upland Woodland
Loess >40”
Loess >12” and <40”
Little or no loess (<12”)
North, East aspects
F115XB003MO – Deep Loess Protected Backslope Forest
F115XB003MO – Deep Loess Protected Backslope Forest
South, West aspects
F115XB043MO – Deep Loess Exposed Backslope Woodland
F115XB043MO – Deep Loess Exposed Backslope Woodland
North, East aspects
F115XB006MO – Loamy Protected Backslope Forest
F115XB006MO – Loamy Protected Backslope Forest
South, West aspects
F115XB044MO – Loamy Exposed Backslope Woodland
F115XB044MO – Loamy Exposed Backslope Woodland
Dolomite/Limestone residuum
Sandstone residuum
Mollic (moist Munsell color value and chroma ≤3; minimum thickness of mollic colors is > 10 inches)
Not Mollic
North, East aspects
F115XB036MO – Calcareous Limestone Protected Backslope Forest
F115XB036MO – Calcareous Limestone Protected Backslope Forest
South, West aspects
F115XB050MO – Calcareous Limestone Exposed Backslope Woodland
F115XB050MO – Calcareous Limestone Exposed Backslope Woodland
Silt Loam surface; not skeletal
Skeletal surface
North, East aspects
F115XB008MO – Loamy Limestone/Dolomite Protected Backslope Forest
F115XB008MO – Loamy Limestone/Dolomite Protected Backslope Forest
South, West aspects
F115XB045MO – Loamy Limestone/Dolomite Exposed Backslope Woodland
F115XB045MO – Loamy Limestone/Dolomite Exposed Backslope Woodland
Bedrock >40”
Bedrock 20-40”
North, East aspects
F115XB011MO – Chert Protected Backslope Forest
F115XB011MO – Chert Protected Backslope Forest
South, West aspects
F115XB048MO – Chert Exposed Backslope Woodland
F115XB048MO – Chert Exposed Backslope Woodland
North, East aspects
F115XB014MO – Chert Limestone/Dolomite Protected Backslope Forest
F115XB014MO – Chert Limestone/Dolomite Protected Backslope Forest
South, West aspects
F115XB046MO – Chert Limestone/Dolomite Exposed Backslope Woodland
F115XB046MO – Chert Limestone/Dolomite Exposed Backslope Woodland
North, East aspects
F115XB017MO – Sandstone Protected Backslope Forest
F115XB017MO – Sandstone Protected Backslope Forest
South, West aspects
F115XB051MO – Sandstone Exposed Backslope Woodland
F115XB051MO – Sandstone Exposed Backslope Woodland
Poorly to Somewhat Poorly Drained
F115XB026MO – Wet Upland Drainageway Forest
F115XB026MO – Wet Upland Drainageway Forest
Moderately Well to Well Drained
F115XB028MO – Loamy/Gravelly Upland Drainageway Forest
F115XB028MO – Loamy/Gravelly Upland Drainageway Forest
Mollic (Historic Prairie)
Not Mollic (Historic Forest)
HAHT (Human altered/human transported - Anthropic) material
F115XB060MO – Anthropic Wet Terrace
F115XB060MO – Anthropic Wet Terrace
Poorly to Somewhat Poorly Drained
R115XB038MO – Wet Terrace Prairie
R115XB038MO – Wet Terrace Prairie
Moderately Well to Well Drained
R115XB037MO – Loamy Terrace Prairie
R115XB037MO – Loamy Terrace Prairie
Poorly to Somewhat Poorly Drained
F115XB025MO – Wet Terrace Forest
F115XB025MO – Wet Terrace Forest
Moderately Well to Well Drained
F115XB024MO – Loamy Terrace Forest
F115XB024MO – Loamy Terrace Forest
Ponded
R115XB042MO – Ponded Floodplain Prairie
R115XB042MO – Ponded Floodplain Prairie
Not ponded
Mississippi/Missouri River floodplain
Secondary stream floodplain
Sandy, loamy
F115XB015MO – Sandy/Loamy Floodplain Forest
F115XB015MO – Sandy/Loamy Floodplain Forest
Clayey
F115XB041MO – Clayey Floodplain Forest
F115XB041MO – Clayey Floodplain Forest
Skeletal
F115XB020MO – Sandy/Gravelly Floodplain Forest
F115XB020MO – Sandy/Gravelly Floodplain Forest
Loamy
F115XB031MO – Loamy Floodplain Forest
F115XB031MO – Loamy Floodplain Forest
Uplands and high stream terraces
Floodplains and low stream terraces subject to flooding
Bedrock limestone <50cm (20")
F115XC001IL – Limestone Glade
F115XC001IL – Limestone Glade
Bedrock >50cm (20")
Loess, loess over glacial till/paleosol, glacial till
Residuum weathered from cherty limestone
Sandy eolian deposits, outwash
Dark surface (mollic epipedon) >25cm (10")
Dark surface (mollic intergrade) 15-25cm (6-10")
R115XC004IL – Loess Upland Savanna
R115XC004IL – Loess Upland Savanna
Light surface (ochric epipedon) or dark surface <15cm (6")
Slopes <18 percent
R115XC002IL – Loess Upland Prairie
R115XC002IL – Loess Upland Prairie
Slopes >18 percent
R115XC003IL – Loess Hill Prairie
R115XC003IL – Loess Hill Prairie
Slopes <18 percent
Slopes >18 percent
Depth to water table >30cm (12")
F115XC005IL – Loess Upland Forest
F115XC005IL – Loess Upland Forest
Depth to water table <30cm (12")
F115XC006IL – Loess Upland Flatwoods
F115XC006IL – Loess Upland Flatwoods
North-East aspects
F115XC007IL – Loess Protected Backslope Forest
F115XC007IL – Loess Protected Backslope Forest
South-West aspects
F115XC008IL – Loess Exposed Backslope Woodland
F115XC008IL – Loess Exposed Backslope Woodland
Slopes >18 percent, North-East aspects
F115XC009IL – Chert Protected Backslope Forest
F115XC009IL – Chert Protected Backslope Forest
Slopes >18 percent, South-West aspects
F115XC010IL – Chert Exposed Backslope Woodland
F115XC010IL – Chert Exposed Backslope Woodland
Dark surface (mollic epipedon) >25cm (10")
Light colored surface (ochric epipedon) or dark surface <15cm (6")
F115XC013IL – Sand Woodland
F115XC013IL – Sand Woodland
Depth to water table >30cm (12")
R115XC011IL – Sand Prairie
R115XC011IL – Sand Prairie
Depth to water table <30cm (12")
R115XC012IL – Wet Sand Prairie
R115XC012IL – Wet Sand Prairie
Low stream terrace, rare to occasionally flooded
Floodplains, occasionally to frequently flooded
Depth to water table >30cm (12")
R115XC014IL – Terrace Savanna
R115XC014IL – Terrace Savanna
Depth to water table <30cm (12")
R115XC015IL – Wet Terrace Sedge Meadow
R115XC015IL – Wet Terrace Sedge Meadow
Site experiences flooding and ponding for long duration
R115XC016IL – Ponded Floodplain Marsh
R115XC016IL – Ponded Floodplain Marsh
Site experiences flooding only
Not directly adjacent to stream channel
Directly adjacent to stream channel
Depth to water table >30cm (12")
R115XC017IL – Floodplain Prairie
R115XC017IL – Floodplain Prairie
Depth to water table <30cm (12")
R115XC018IL – Wet Floodplain Sedge Meadow
R115XC018IL – Wet Floodplain Sedge Meadow
Clayey alluvium, Poorly drained
F115XC019IL – Clayey Floodplain Forest
F115XC019IL – Clayey Floodplain Forest
Silty or loamy alluvium, Somewhat Poorly to Well drained
F115XC020IL – Loamy Floodplain Forest
F115XC020IL – Loamy Floodplain Forest
Sandy or gravelly alluvium, Well to Excessively drained
F115XC021IL – Sandy Floodplain Forest
F115XC021IL – Sandy Floodplain Forest
Long term average mean annual precipitation
- No filter
- 80 – 100cm (31 – 39in)
- 100 – 120cm (39 – 47in)
—
cm
Long term average frost free days
- No filter
- 130 – 150days
- 150 – 170days
- 170 – 190days
—
days
- No filter
- 0 – 200m (0 – 700ft)
- 200 – 400m (700 – 1300ft)
- 400 – 600m (1300 – 2000ft)
- 600 – 800m (2000 – 2600ft)
- 800 – 1000m (2600 – 3300ft)
- 1000 – 1200m (3300 – 3900ft)
—
m
- No filter
- 0 – 3%
- 3 – 5%
- 5 – 10%
- 10 – 15%
- 15 – 20%
- 20 – 25%
- 25 – 30%
- 30 – 35%
- 35 – 40%
- 40 – 45%
- 45 – 50%
- 50 – 60%
- 60 – 70%
—
%
- No filter
- Bluff
- Cliff
- Depression
- Drainageway
- Dune
- Flat
- Flood plain
- Flood-plain step
- Glacial lake (relict)
- Ground moraine
- Hill
- Hillside
- Hillside or mountainside
- Hillslope
- Interfluve
- Lake plain
- Lake terrace
- Loess hill
- Outwash plain
- Outwash terrace
- Ridge
- Stream terrace
- Structural bench
- Terrace
- Till plain
- Upland slope
- No filter
- Chert
- Dolomite (dolostone)
- Limestone and dolomite
- Limestone, unspecified
- Sandstone and shale
- Sandstone, unspecified
- No filter
- Alluvium
- Colluvium
- Earth spread deposits
- Eolian deposits
- Eolian sands
- Glaciolacustrine deposits
- Lacustrine deposits
- Loess
- Marl
- Organic, herbaceous material
- Organic, unspecified
- Outwash
- Pedisediment
- Residuum
- Slope alluvium
- Till, unspecified
Soil surface texture
- No filter
- Clay
- Clay loam
- Coarse sand
- Coarse sandy loam
- Fine sand
- Fine sandy loam
- Loam
- Loamy fine sand
- Loamy sand
- Silt
- Silty clay
- Silty clay loam
- Silt loam
- Sandy loam
- Very fine sand
- Very fine sandy loam
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Ecological site keys
115XA
I.
Uplands
A.
Slopes <18%
a.
No depth restrictions
b.
Depth restrictions
B.
Slopes >18%
II.
Dunes
III.
Terraces/Lakeplains
A.
Mineral
a.
Somewhat poorly drained to very poorly drained
b.
Moderately well drained to well drained
1
No fragipan
c.
Loamy
2
Fragipan -not described at this time
B.
Organic
IV.
Floodplains
A.
Textural family - fine
B.
Textural family - course silty to fine silty
115XB
I.
Upland Summits, Shoulders or Backslopes
A.
Bedrock < 20”
1
Steep slope dominant (upper slope range to 70%)
2
Steep slope minor
B.
Bedrock > 20”
1
<15% slope
i.
Loess >40”
ii.
Loess >12” and <40”
iii.
Little or no loess (<12”)
a.
Dolomite/Limestone residuum
2
>15% slope
i.
Loess >40”
ii.
Loess >12” and <40”
iii.
Little or no loess (<12”)
a.
Dolomite/Limestone residuum
1)
Mollic (moist Munsell color value and chroma ≤3; minimum thickness of mollic colors is > 10 inches)
2)
Not Mollic
a)
Silt Loam surface; not skeletal
b)
Skeletal surface
(1)
Bedrock >40”
(2)
Bedrock 20-40”
b.
Sandstone residuum
II.
Upland Drainageways
V.
Low Terraces and Floodplain Steps
A.
Mollic (Historic Prairie)
B.
Not Mollic (Historic Forest)
C.
HAHT (Human altered/human transported - Anthropic) material
... F115XB060MO – Anthropic Wet Terrace
VI.
VI. Floodplains (occasional to frequent flooding)
B.
Not ponded
1
Mississippi/Missouri River floodplain
2
Secondary stream floodplain
115XC
I.
Uplands and high stream terraces
B.
Bedrock >50cm (20")
1
Loess, loess over glacial till/paleosol, glacial till
i.
Dark surface (mollic epipedon) >25cm (10")
iii.
Light surface (ochric epipedon) or dark surface <15cm (6")
a.
Slopes <18 percent
b.
Slopes >18 percent
2
Residuum weathered from cherty limestone
3
Sandy eolian deposits, outwash
i.
Dark surface (mollic epipedon) >25cm (10")
ii.
Light colored surface (ochric epipedon) or dark surface <15cm (6")
... F115XC013IL – Sand Woodland
II.
Floodplains and low stream terraces subject to flooding
A.
Low stream terrace, rare to occasionally flooded
B.
Floodplains, occasionally to frequently flooded
2
Site experiences flooding only
i.
Not directly adjacent to stream channel
ii.
Directly adjacent to stream channel
b.
Silty or loamy alluvium, Somewhat Poorly to Well drained
... F115XC020IL – Loamy Floodplain Forest
c.
Sandy or gravelly alluvium, Well to Excessively drained
... F115XC021IL – Sandy Floodplain Forest
The Ecosystem Dynamics Interpretive Tool is an information system framework developed by the USDA-ARS Jornada Experimental Range, USDA Natural Resources Conservation Service, and New Mexico State University.
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