Natural Resources
Conservation Service
Major Land Resource Area 146X
Major Land Resource Area
Accessed: 04/24/2026
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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
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precipitation
frost free days
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Precipitation
Frost free days
Elevation
Slope
Landform
Parent material origin
Parent material kind
Soil texture
Site occurs along major rivers and streams which, in absence of dams and man-made structures, would experience regular flooding
F146XY011ME – Floodplain
F146XY011ME – Floodplain
Site does not occur along major rivers and streams, or if it does occur along major rivers and streams, the site does not experience regular flooding
Site occurs in open wetland areas dominated by shrubs and/or herbaceous species, too wet for tree cover to exceed 40 percent under natural conditions
F146XY021ME – Marsh
F146XY021ME – Marsh
Site supports greater than 40 percent tree cover under natural conditions
Soils poorly to very poorly-drained, meeting hydric conditions
Soils somewhat poorly- to excessively-drained with non-hydric conditions
Soil surface consists of greater than 40 inches (100 cm) of organic mucky peat deposits
F146XY031ME – Mucky Peat Bottom
F146XY031ME – Mucky Peat Bottom
Soil surface with less than 40 inches (100 cm) of organic mucky peat deposits
Soils formed in shallow till, with densely compacted, gravelly layer usually within 20 inches (50 cm) of mineral soil surface
F146XY032ME – Loamy Till Bottom
F146XY032ME – Loamy Till Bottom
Soils not formed in till, lacking dense subsurface layer
Soils ponded for most or all of the year
F146XY034ME – Wet Sandy Bog
F146XY034ME – Wet Sandy Bog
Soils not ponded for extended periods
F146XY033ME – Wet Loamy Flat
F146XY033ME – Wet Loamy Flat
Site occurs in exposed areas high in rock outcrop with little soil available for plants, too harsh for significant tree cover
F146XY051ME – Rockland
F146XY051ME – Rockland
Site not as above, with sufficient soil to support greater than 40 percent tree cover
Bedrock within 20 inches (50 cm) of mineral soil surface
F146XY061ME – Shallow Loamy Till
F146XY061ME – Shallow Loamy Till
Bedrock deeper than 20 inches (50 cm) below mineral soil surface
Soils sandy throughout, typically on eskers and other glacial outwash
F146XY071ME – Sandy
F146XY071ME – Sandy
Soils loamy on the surface, may have sandy subsurface horizons
Soils with a sandy subsurface horizons and a loamy surface horizon, typically on eskers and other glacial outwash
F146XY072ME – Loamy Over Sandy
F146XY072ME – Loamy Over Sandy
Soils loamy on surface and throughout the profile
Soils formed in lakebed sediments with few rock fragments
F146XY084ME – Silty
F146XY084ME – Silty
Soils formed in glacial till
Soil pH mostly less than 6.0
F146XY081ME – Loamy Acidic Till
F146XY081ME – Loamy Acidic Till
Soil pH mostly above 6.0
F146XY082ME – Loamy Calcareous Till
F146XY082ME – Loamy Calcareous Till
Long term average mean annual precipitation
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cm
Long term average frost free days
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- 70 – 90days
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days
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- 0 – 200m (0 – 700ft)
- 200 – 400m (700 – 1300ft)
- 400 – 600m (1300 – 2000ft)
- 600 – 800m (2000 – 2600ft)
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m
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- 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%
- 90 – 100%
—
%
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- Cliff
- Drumlin
- Esker
- Flood plain
- Flood-plain step
- Ground moraine
- Hill
- Kame
- Lake plain
- Lakebed
- Marsh
- Outwash plain
- Outwash terrace
- Ridge
- Stream terrace
- Swamp
- Till plain
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- Granite
- Limestone and shale
- Phyllite
- Quartzite
- Shale and siltstone
- Siltstone, calcareous
- Siltstone, unspecified
- Slate
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- Alluvium
- Glaciofluvial deposits
- Glaciolacustrine deposits
- Organic, unspecified
- Till, lodgment
- Till, melt-out
- Till, subglacial
- Till, supraglacial meltout
Soil surface texture
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- Coarse sand
- Fine sandy loam
- Loam
- Silt loam
- Sandy loam
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Ecological site keys
MLRA 146
1a.
Site occurs along major rivers and streams which, in absence of dams and man-made structures, would experience regular flooding
... F146XY011ME – Floodplain
1b.
Site does not occur along major rivers and streams, or if it does occur along major rivers and streams, the site does not experience regular flooding
2a.
Site occurs in open wetland areas dominated by shrubs and/or herbaceous species, too wet for tree cover to exceed 40 percent under natural conditions
... F146XY021ME – Marsh
2b.
Site supports greater than 40 percent tree cover under natural conditions
3a.
Soils poorly to very poorly-drained, meeting hydric conditions
4a.
Soil surface consists of greater than 40 inches (100 cm) of organic mucky peat deposits
... F146XY031ME – Mucky Peat Bottom
4b.
Soil surface with less than 40 inches (100 cm) of organic mucky peat deposits
5a.
Soils formed in shallow till, with densely compacted, gravelly layer usually within 20 inches (50 cm) of mineral soil surface
... F146XY032ME – Loamy Till Bottom
5b.
Soils not formed in till, lacking dense subsurface layer
3b.
Soils somewhat poorly- to excessively-drained with non-hydric conditions
7a.
Site occurs in exposed areas high in rock outcrop with little soil available for plants, too harsh for significant tree cover
... F146XY051ME – Rockland
7b.
Site not as above, with sufficient soil to support greater than 40 percent tree cover
8b.
Bedrock deeper than 20 inches (50 cm) below mineral soil surface
9b.
Soils loamy on the surface, may have sandy subsurface horizons
10a.
Soils with a sandy subsurface horizons and a loamy surface horizon, typically on eskers and other glacial outwash
... F146XY072ME – Loamy Over Sandy
10b.
Soils loamy on surface and throughout the profile
11b.
Soils formed in glacial till
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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