Major Land Resource Area 107X
Iowa and Missouri Deep Loess Hills
Accessed: 12/21/2024
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-
i
Key Characteristics
- Not as above
- Floodplain
- Frequently flooded, depth to water table > 18 inches (45 cm), and located within the Little Sioux River floodplain
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Loess parent material
- No Carbonates
- Lower Clay (<30%)
- Slopes > 15%
- North and East Aspects
-
i
Key Characteristics
- Sites located on an upland on a depression, drainageways, or footslope
- Skeletal
- Footslope
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Loess parent material
- Carbonates below cambic
- Slopes < 15%
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Loess parent material
- Carbonates below cambic
- Slopes > 15%
- North and East Aspects
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Loess parent material
- Carbonates below cambic
- Slopes > 15%
- South and West Aspects
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Floodplain
- Not Ponded
- Adjacent to stream channel
- Sandy, coarse-loamy
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Floodplain
- Not Ponded
- Adjacent to stream channel
- Loamy, fine-loamy, fine-silty
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Floodplain
- Not Ponded
- Adjacent to stream channel
- Clayey
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Floodplain
- Not Ponded
- Not adjacent to stream channel
- Somewhat Poorly, Coarse-silty, Fine-silty
-
i
Key Characteristics
- Uplands
- Summits, Shoulder & Backslopes
- Loess
-
i
Key Characteristics
- Uplands
- Summits, Shoulder & Backslopes
- Calcareous till
- Slopes ≤20%
-
i
Key Characteristics
- Uplands
- Summits, Shoulder & Backslopes
- Calcareous till
- Slopes ≥20%
- South and West aspects
-
i
Key Characteristics
- Uplands
- Summits, Shoulder & Backslopes
- Calcareous till
- Slopes ≥20%
- North and East aspects
-
i
Key Characteristics
- Uplands
- Summits, Shoulder & Backslopes
- Loamy sediments
-
i
Key Characteristics
- Uplands
- Summits, Shoulder & Backslopes
- Outwash (including ≤ 40 inches (100 cm) loess over outwash)
-
i
Key Characteristics
- Uplands
- Summits, Shoulder & Backslopes
- Eolian sands
-
i
Key Characteristics
- Uplands
- Upland Flats & Depressions, slopes 0-2%
- Ponded
-
i
Key Characteristics
- Uplands
- Upland Flats & Depressions, slopes 0-2%
- Not ponded
- not as above
-
i
Key Characteristics
- Uplands
- Upland Flats & Depressions, slopes 0-2%
- Not ponded
- Drainageway
-
i
Key Characteristics
- Not as above
- Valley footslope, colluvial parent material
-
i
Key Characteristics
- Not as above
- Stream terrace
-
i
Key Characteristics
- Not as above
- Floodplain
- Not as above
- Deep to water table (≥30cm), Somewhat Poorly to Moderately Well drained
-
i
Key Characteristics
- Not as above
- Floodplain
- Not as above
- Shallow to water table (<12 inches (30 cm)), Poorly to Very Poorly drained
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Loess parent material
- No Carbonates
- Lower Clay (<30%)
- Slopes < 15%
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Loess parent material
- No Carbonates
- Lower Clay (<30%)
- Slopes > 15%
- South and West Aspects
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Loess parent material
- Carbonates at or near the surface
- Slopes ≥ 15 percent
- South and West Aspects
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Loess parent material
- No Carbonates
- Higher Clay (>30%)
- All slopes
-
i
Key Characteristics
- Sites located on an upland on a depression, drainageways, or footslope
- Loess
- Footslope
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Loess parent material
- Carbonates at or near the surface
- Slopes ≤ 15 percent
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Loess parent material
- Carbonates at or near the surface
- Slopes ≥ 15 percent
- North and East Aspects
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Stream Terrace
- Somewhat Poorly to Poorly drained
- Loamy soils with silt loam surface texture
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Floodplain
- Ponded
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Floodplain
- Not Ponded
- Not adjacent to stream channel
- Somewhat Poorly to Poorly, Clayey
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Stream Terrace
- Moderately Well to Well drained
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Stream Terrace
- Somewhat Poorly to Poorly drained
- Clayey soils with silty clay loam, silty clay or clay surface textures
-
i
Key Characteristics
- Sites located on an upland on a depression, drainageways, or footslope
- Loess
- Depression
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Floodplain
- Not Ponded
- Not adjacent to stream channel
- Salt/gypsum
-
i
Key Characteristics
- Sites located on an upland on a depression, drainageways, or footslope
- Loess
- Drainageway
-
i
Key Characteristics
- Sites located on a lowland on a stream terrace or floodplain
- Floodplain
- Not Ponded
- Not adjacent to stream channel
- Moderately Well drained, Loamy
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Till parent material
- Carbonates at/near surface
- All slopes
-
i
Key Characteristics
- Sites located on an upland on a summit, shoulder, or backslope
- Sands parent material
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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.
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
Ecological site photos
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Ecological sites
Major Land Resource Areas
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.
