Natural Resources
Conservation Service
Major Land Resource Area 107X
Major Land Resource Area
Accessed: 04/16/2026
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1
Select an ecological site
Select an ecological site using the list, keys, photos, briefcase, or quick search option located on this page. -
2
Explore the ecological site description
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.
Ecological site list
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precipitation
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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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Add ecological sites and Major Land Resource Areas to your briefcase by clicking on the briefcase (
) icon wherever it occurs. Drag and drop items to reorder. Cookies are used to store briefcase items between browsing sessions. Because of this, the number of items that can be added to your briefcase is limited, and briefcase items added on one device and browser cannot be accessed from another device or browser. Users who do not wish to place cookies on their devices should not use the briefcase tool. Briefcase cookies serve no other purpose than described here and are deleted whenever browsing history is cleared.
Ecological sites
Major Land Resource Areas
Ecological site photos
Tools
Filter by
interactive key
precipitation
frost free days
more..
clear all
Type
Image size
Done
Filters
Interactive key
Precipitation
Frost free days
Elevation
Slope
Landform
Parent material origin
Parent material kind
Soil texture
Uplands
Not as above
Summits, Shoulder & Backslopes
Upland Flats & Depressions, slopes 0-2%
Loess
R107XA201IA – Loess Upland Prairie
R107XA201IA – Loess Upland Prairie
Calcareous till
Loamy sediments
R107XA205IA – Loamy Sediment Upland Prairie
R107XA205IA – Loamy Sediment Upland Prairie
Outwash (including ≤ 40 inches (100 cm) loess over outwash)
R107XA206IA – Outwash Upland Prairie
R107XA206IA – Outwash Upland Prairie
Eolian sands
R107XA207IA – Sandy Dry Prairie
R107XA207IA – Sandy Dry Prairie
Slopes ≤20%
R107XA202IA – Calcareous Till Upland Prairie
R107XA202IA – Calcareous Till Upland Prairie
Slopes ≥20%
South and West aspects
R107XA203IA – Calcareous Till Exposed Backslope Prairie
R107XA203IA – Calcareous Till Exposed Backslope Prairie
North and East aspects
R107XA204IA – Calcareous Till Protected Backslope Savanna
R107XA204IA – Calcareous Till Protected Backslope Savanna
Ponded
R107XA208IA – Ponded Upland Depression Sedge Meadow
R107XA208IA – Ponded Upland Depression Sedge Meadow
Not ponded
Drainageway
R107XA210IA – Wet Upland Drainageway Prairie
R107XA210IA – Wet Upland Drainageway Prairie
not as above
R107XA209IA – Wet Upland Sedge Meadow
R107XA209IA – Wet Upland Sedge Meadow
Valley footslope, colluvial parent material
R107XA211IA – Footslope Prairie
R107XA211IA – Footslope Prairie
Stream terrace
R107XA212IA – Stream Terrace Prairie
R107XA212IA – Stream Terrace Prairie
Floodplain
Frequently flooded, depth to water table > 18 inches (45 cm), and located within the Little Sioux River floodplain
F107XA213IA – Loamy Floodplain Forest
F107XA213IA – Loamy Floodplain Forest
Not as above
Deep to water table (≥30cm), Somewhat Poorly to Moderately Well drained
R107XA214IA – Loamy Floodplain Prairie
R107XA214IA – Loamy Floodplain Prairie
Shallow to water table (<12 inches (30 cm)), Poorly to Very Poorly drained
R107XA215IA – Wet Floodplain Sedge Meadow
R107XA215IA – Wet Floodplain Sedge Meadow
Sites located on an upland on a summit, shoulder, or backslope
Sites located on an upland on a depression, drainageways, or footslope
Sites located on a lowland on a stream terrace or floodplain
Loess parent material
Till parent material
Sands parent material
R107XB030IA – Sandy Dune Prairie
R107XB030IA – Sandy Dune Prairie
Carbonates at or near the surface
Carbonates below cambic
No Carbonates
Slopes ≤ 15 percent
R107XB012MO – Calcareous Loess Upland Prairie
R107XB012MO – Calcareous Loess Upland Prairie
Slopes ≥ 15 percent
North and East Aspects
R107XB013MO – Calcareous Loess Protected Backslope Savanna
R107XB013MO – Calcareous Loess Protected Backslope Savanna
South and West Aspects
R107XB006MO – Calcareous Loess Exposed Backslope Prairie
R107XB006MO – Calcareous Loess Exposed Backslope Prairie
Slopes < 15%
F107XB009MO – Calcareous Loess Upland Woodland
F107XB009MO – Calcareous Loess Upland Woodland
Slopes > 15%
North and East Aspects
F107XB010MO – Calcareous Loess Protected Backslope Forest
F107XB010MO – Calcareous Loess Protected Backslope Forest
South and West Aspects
F107XB011MO – Calcareous Loess Exposed Backslope Woodland
F107XB011MO – Calcareous Loess Exposed Backslope Woodland
Lower Clay (<30%)
Higher Clay (>30%)
Slopes < 15%
R107XB002MO – Deep Loess Upland Prairie
R107XB002MO – Deep Loess Upland Prairie
Slopes > 15%
North and East Aspects
F107XB004MO – Deep Loess Protected Backslope Woodland
F107XB004MO – Deep Loess Protected Backslope Woodland
South and West Aspects
R107XB003MO – Deep Loess Exposed Backslope Savanna
R107XB003MO – Deep Loess Exposed Backslope Savanna
All slopes
R107XB007MO – Loess Upland Prairie
R107XB007MO – Loess Upland Prairie
Carbonates at/near surface
All slopes
R107XB027IA – Calcareous Till Upland Prairie
R107XB027IA – Calcareous Till Upland Prairie
Loess
Skeletal
Depression
R107XB022IA – Wet Upland Depression Prairie
R107XB022IA – Wet Upland Depression Prairie
Drainageway
R107XB024IA – Wet Upland Drainageway Prairie
R107XB024IA – Wet Upland Drainageway Prairie
Footslope
R107XB008MO – Loamy Footslope Savanna
R107XB008MO – Loamy Footslope Savanna
Footslope
F107XB005MO – Talus Footslope Forest
F107XB005MO – Talus Footslope Forest
Stream Terrace
Floodplain
Moderately Well to Well drained
R107XB020MO – Loamy Terrace Savanna
R107XB020MO – Loamy Terrace Savanna
Somewhat Poorly to Poorly drained
Clayey soils with silty clay loam, silty clay or clay surface textures
R107XB021MO – Wet Terrace Savanna
R107XB021MO – Wet Terrace Savanna
Loamy soils with silt loam surface texture
R107XB014MO – Wet Loess High Terrace Savanna
R107XB014MO – Wet Loess High Terrace Savanna
Ponded
R107XB018MO – Ponded Floodplain Marsh
R107XB018MO – Ponded Floodplain Marsh
Not Ponded
Adjacent to stream channel
Not adjacent to stream channel
Sandy, coarse-loamy
F107XB015MO – Sandy/Loamy Floodplain Forest
F107XB015MO – Sandy/Loamy Floodplain Forest
Loamy, fine-loamy, fine-silty
F107XB016MO – Loamy Floodplain Forest
F107XB016MO – Loamy Floodplain Forest
Clayey
F107XB017MO – Clayey Floodplain Forest
F107XB017MO – Clayey Floodplain Forest
Moderately Well drained, Loamy
R107XB025IA – Loamy Floodplain Prairie
R107XB025IA – Loamy Floodplain Prairie
Somewhat Poorly to Poorly, Clayey
R107XB019MO – Wet Floodplain Prairie
R107XB019MO – Wet Floodplain Prairie
Somewhat Poorly, Coarse-silty, Fine-silty
F107XB026MO – Wet Floodplain Woodland
F107XB026MO – Wet Floodplain Woodland
Salt/gypsum
R107XB023IA – Natric Floodplain Prairie
R107XB023IA – Natric Floodplain Prairie
Long term average mean annual precipitation
- No filter
- 60 – 80cm (24 – 31in)
- 80 – 100cm (31 – 39in)
—
cm
Long term average frost free days
- No filter
- 110 – 130days
- 130 – 150days
- 150 – 170days
—
days
- No filter
- 0 – 200m (0 – 700ft)
- 200 – 400m (700 – 1300ft)
- 400 – 600m (1300 – 2000ft)
- 600 – 800m (2000 – 2600ft)
- 800 – 1000m (2600 – 3300ft)
—
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%
- 70 – 80%
- 80 – 90%
—
%
- No filter
- Alluvial fan
- Bluff
- Depression
- Drainageway
- Flat
- Flood plain
- Flood-plain step
- Hill
- Hillslope
- Interfluve
- Loess hill
- Ridge
- Stream terrace
- Terrace
- No filter
- Dolomite (dolostone)
- No filter
- Alluvium
- Colluvium
- Eolian deposits
- Eolian sands
- Loess
- Loess, calcareous
- Outwash
- Till, unspecified
Soil surface texture
- No filter
- Clay
- Loam
- Loamy fine sand
- Silty clay
- Silty clay loam
- Silt loam
- Very fine sandy loam
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Ecological site keys
MLRA 107A Key to Provisional Ecological Sites
I.
Uplands
A.
Summits, Shoulder & Backslopes
2
Calcareous till
ii.
Slopes ≥20%
4
Outwash (including ≤ 40 inches (100 cm) loess over outwash)
... R107XA206IA – Outwash Upland Prairie
B.
Upland Flats & Depressions, slopes 0-2%
2
Not ponded
II.
Not as above
C.
Floodplain
1
Frequently flooded, depth to water table > 18 inches (45 cm), and located within the Little Sioux River floodplain
... F107XA213IA – Loamy Floodplain Forest
2
Not as above
i.
Deep to water table (≥30cm), Somewhat Poorly to Moderately Well drained
... R107XA214IA – Loamy Floodplain Prairie
ii.
Shallow to water table (<12 inches (30 cm)), Poorly to Very Poorly drained
... R107XA215IA – Wet Floodplain Sedge Meadow
MLRA 107B Key to Provisional Ecological Sites
I.
Sites located on an upland on a summit, shoulder, or backslope
A.
Loess parent material
1
Carbonates at or near the surface
ii.
Slopes ≥ 15 percent
2
Carbonates below cambic
ii.
Slopes > 15%
3
No Carbonates
i.
Lower Clay (<30%)
b.
Slopes > 15%
ii.
Higher Clay (>30%)
B.
Till parent material
1
Carbonates at/near surface
II.
Sites located on an upland on a depression, drainageways, or footslope
A.
Loess
B.
Skeletal
III.
Sites located on a lowland on a stream terrace or floodplain
A.
Stream Terrace
2
Somewhat Poorly to Poorly drained
i.
Clayey soils with silty clay loam, silty clay or clay surface textures
... R107XB021MO – Wet Terrace Savanna
B.
Floodplain
2
Not Ponded
i.
Adjacent to stream channel
ii.
Not adjacent to stream channel
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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