Natural Resources
Conservation Service
Major Land Resource Area 120A
Major Land Resource Area
Accessed: 04/22/2026
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Select an ecological site using the list, keys, photos, briefcase, or quick search option located on this page. -
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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Viewing 17 of 17
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i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
Ecological site map
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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 (
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Ecological sites
Major Land Resource Areas
Ecological site photos
Tools
Filter by
interactive key
precipitation
frost free days
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Interactive key
Precipitation
Frost free days
Elevation
Slope
Landform
Parent material origin
Parent material kind
Soil texture
Dichotomous Key
Outline
Non [not] Human Transported Materials or Mine Spoils
Human Transported material or Mine Spoils
Not water-deposited (Alluvium, Lacustrine) materials otherwise e.g., Uplands (Residuum, Colluvium)
Wind deposited Eolian material or water deposited Alluvium or Lacustrine material
No Fragipan present
Fragipan present - Fragipan Uplands… F120AY002KY
F120AY002KY – Fragipan Uplands
F120AY002KY – Fragipan Uplands
Sandy or Loamy-skeletal - Loamy Skeletal Uplands… F120AY008KY
F120AY008KY – Loamy Skeletal Uplands
F120AY008KY – Loamy Skeletal Uplands
Not Loamy-skeletal
Soil Depth: Not Shallow - Moderately Deep Sandstone-Shale Uplands… F120AY005KY
F120AY005KY – Moderately Deep Sandstone-Shale Uplands
F120AY005KY – Moderately Deep Sandstone-Shale Uplands
Soil Depth: Shallow - Shallow Sandstone Uplands… F120AY006KY
F120AY006KY – Shallow Sandstone Uplands
F120AY006KY – Shallow Sandstone Uplands
Wind deposited Eolian materials - Loess and Dunes
Water deposited - Alluvium or Lacustrine material
No Fragipan present
Fragipan present - go to: Fragipan Uplands F120AY002KY
F120AY002KY – Fragipan Uplands
F120AY002KY – Fragipan Uplands
Eolian Dunes or sands – go to: Well Drained High Terraces F120AY010KY
F120AY010KY – Well-Drained High Terraces
F120AY010KY – Well-Drained High Terraces
Eolian Loess
Thin Loss/Loess capped - Loess Veneered Sandstone-Shale Uplands… F120AY004KY
F120AY004KY – Loess Veneered Sandstone-Shale Uplands
F120AY004KY – Loess Veneered Sandstone-Shale Uplands
Formed in Loess
Not poorly-drained or very poorly-drained
Poorly-drained or very poorly-drained – go to: Saturated Flats F120AY014KY
F120AY014KY – Saturated Flats
F120AY014KY – Saturated Flats
Slopes equal to or less than 10 percent - Deep Loess… F120AY001KY
F120AY001KY – Deep Loess
F120AY001KY – Deep Loess
Slopes greater than 10% - Loess Uplands… F120AY003KY
F120AY003KY – Loess Uplands
F120AY003KY – Loess Uplands
Not actively flooded (to rarely flooded) Alluvium or Lacustrine material –Terraces and Lacustrine
Actively flooded - Floodplains and Drainageways
Excessively-drained to well-drained - Well Drained High Terraces… F120AY010KY
F120AY010KY – Well-Drained High Terraces
F120AY010KY – Well-Drained High Terraces
Well-drained and Moderately well-drained to very poorly-drained
Well drained and moderately well-drained – Well Drained And Moderately Well Drained Terraces… F120AY011KY
F120AY011KY – Well Drained And Moderately Well Drained Terraces
F120AY011KY – Well Drained And Moderately Well Drained Terraces
Somewhat poorly-drained to very poorly drained
Somewhat poorly-drained - Moist Terraces… F120AY013KY
F120AY013KY – Moist Terraces
F120AY013KY – Moist Terraces
Poorly-drained to very poorly-drained - Saturated Flats… F120AY014KY
F120AY014KY – Saturated Flats
F120AY014KY – Saturated Flats
Excessively-drained to well-drained
Somewhat poorly-drained to very-poorly-drained
Headwaters with narrow floodways - Loamy Alluvial Headwaters… F120AY015KY
F120AY015KY – Loamy Alluvial Headwaters
F120AY015KY – Loamy Alluvial Headwaters
Not headwaters
Loamy, - Riverbank Loamy Alluvium… F120AY018KY
F120AY018KY – Riverbank Loamy Alluvium
F120AY018KY – Riverbank Loamy Alluvium
Silty - Well Drained Silty Alluvium… F120AY017KY
F120AY017KY – Well Drained Silty Alluvium
F120AY017KY – Well Drained Silty Alluvium
Somewhat poorly-drained to moderately well-drained floodplains - Moist Silty Alluvium… F120AY019KY
F120AY019KY – Moist Silty Alluvium
F120AY019KY – Moist Silty Alluvium
Poorly-drained to very poorly-drained
Poorly Drained to very poorly-drained and NOT mapunits labelled “ponded” - Wet Alluvial Flats… F120AY020KY
F120AY020KY – Wet Alluvial Flats
F120AY020KY – Wet Alluvial Flats
“Ponded” labelled mapunits: - Ponded Alluvial Flats… F120AY022KY
F120AY022KY – Ponded Alluvial Flats
F120AY022KY – Ponded Alluvial Flats
Not poorly-drained or very poorly-drained - RESERVED
Poorly- drained or very poorly-drained - RESERVED
Uplands
Upland Flats
F120AY014KY – Saturated Flats
F120AY014KY – Saturated Flats
High Terraces
F120AY010KY – Well-Drained High Terraces
F120AY010KY – Well-Drained High Terraces
Terraces
Floodplains
Formed in Loess
Loess- Capped
F120AY004KY – Loess Veneered Sandstone-Shale Uplands
F120AY004KY – Loess Veneered Sandstone-Shale Uplands
Fragipan
F120AY002KY – Fragipan Uplands
F120AY002KY – Fragipan Uplands
No Fragipan
Slopes less than 10%
F120AY001KY – Deep Loess
F120AY001KY – Deep Loess
Slopes greater than 10%
F120AY003KY – Loess Uplands
F120AY003KY – Loess Uplands
Depth: Moderately Deep
F120AY005KY – Moderately Deep Sandstone-Shale Uplands
F120AY005KY – Moderately Deep Sandstone-Shale Uplands
Depth: Shallow
F120AY006KY – Shallow Sandstone Uplands
F120AY006KY – Shallow Sandstone Uplands
Sandy or Loamy Skeletal
F120AY008KY – Loamy Skeletal Uplands
F120AY008KY – Loamy Skeletal Uplands
Well Drained and Moderately Well Drained
F120AY011KY – Well Drained And Moderately Well Drained Terraces
F120AY011KY – Well Drained And Moderately Well Drained Terraces
Moist (SWPD)
F120AY013KY – Moist Terraces
F120AY013KY – Moist Terraces
Well Drained Headwaters
F120AY015KY – Loamy Alluvial Headwaters
F120AY015KY – Loamy Alluvial Headwaters
Well Drained Floodplains
Somewhat poorly drained to Moderately Well Drained Floodplains
F120AY019KY – Moist Silty Alluvium
F120AY019KY – Moist Silty Alluvium
Poorly Drained
Loamy
F120AY018KY – Riverbank Loamy Alluvium
F120AY018KY – Riverbank Loamy Alluvium
Silty
F120AY017KY – Well Drained Silty Alluvium
F120AY017KY – Well Drained Silty Alluvium
Wet Alluvial Flats
F120AY020KY – Wet Alluvial Flats
F120AY020KY – Wet Alluvial Flats
Ponded Alluvial Flats (Ponded mapunits)
F120AY022KY – Ponded Alluvial Flats
F120AY022KY – Ponded Alluvial Flats
Long term average mean annual precipitation
- No filter
- 120 – 140cm (47 – 55in)
—
cm
Long term average frost free days
- No filter
- 150 – 170days
—
days
- No filter
- 0 – 200m (0 – 700ft)
- 200 – 400m (700 – 1300ft)
—
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%
—
%
- No filter
- Drainageway
- Flat
- Flood plain
- Flood-plain step
- Hill
- Hillside
- Hillslope
- Loess hill
- Ridge
- Stream terrace
- Terrace
- No filter
- Sandstone and shale
- Sandstone and siltstone
- Shale and siltstone
- Shale, unspecified
- No filter
- Alluvium
- Colluvium
- Loess
- Loess, noncalcareous
- Residuum
Soil surface texture
- No filter
- Fine sandy loam
- Loam
- Loamy fine sand
- Loamy sand
- Sandy clay loam
- Silty clay
- Silty clay loam
- Silt loam
- Sandy loam
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Ecological site keys
120A PES Key (dichotomous)
1a.
Non [not] Human Transported Materials or Mine Spoils
2a.
Not water-deposited (Alluvium, Lacustrine) materials otherwise e.g., Uplands (Residuum, Colluvium)
3a.
No Fragipan present
4a.
Sandy or Loamy-skeletal - Loamy Skeletal Uplands… F120AY008KY
... F120AY008KY – Loamy Skeletal Uplands
4b.
Not Loamy-skeletal
5a.
Soil Depth: Not Shallow - Moderately Deep Sandstone-Shale Uplands… F120AY005KY
... F120AY005KY – Moderately Deep Sandstone-Shale Uplands
5b.
Soil Depth: Shallow - Shallow Sandstone Uplands… F120AY006KY
... F120AY006KY – Shallow Sandstone Uplands
2b.
Wind deposited Eolian material or water deposited Alluvium or Lacustrine material
6a.
Wind deposited Eolian materials - Loess and Dunes
7a.
No Fragipan present
8a.
Eolian Dunes or sands – go to: Well Drained High Terraces F120AY010KY
... F120AY010KY – Well-Drained High Terraces
8b.
Eolian Loess
9a.
Thin Loss/Loess capped - Loess Veneered Sandstone-Shale Uplands… F120AY004KY
... F120AY004KY – Loess Veneered Sandstone-Shale Uplands
9b.
Formed in Loess
10a.
Not poorly-drained or very poorly-drained
10b.
Poorly-drained or very poorly-drained – go to: Saturated Flats F120AY014KY
... F120AY014KY – Saturated Flats
6b.
Water deposited - Alluvium or Lacustrine material
12a.
Not actively flooded (to rarely flooded) Alluvium or Lacustrine material –Terraces and Lacustrine
13a.
Excessively-drained to well-drained - Well Drained High Terraces… F120AY010KY
... F120AY010KY – Well-Drained High Terraces
13b.
Well-drained and Moderately well-drained to very poorly-drained
14a.
Well drained and moderately well-drained – Well Drained And Moderately Well Drained Terraces… F120AY011KY
... F120AY011KY – Well Drained And Moderately Well Drained Terraces
14b.
Somewhat poorly-drained to very poorly drained
15b.
Poorly-drained to very poorly-drained - Saturated Flats… F120AY014KY
... F120AY014KY – Saturated Flats
12b.
Actively flooded - Floodplains and Drainageways
16a.
Excessively-drained to well-drained
17a.
Headwaters with narrow floodways - Loamy Alluvial Headwaters… F120AY015KY
... F120AY015KY – Loamy Alluvial Headwaters
17b.
Not headwaters
16b.
Somewhat poorly-drained to very-poorly-drained
19a.
Somewhat poorly-drained to moderately well-drained floodplains - Moist Silty Alluvium… F120AY019KY
... F120AY019KY – Moist Silty Alluvium
19b.
Poorly-drained to very poorly-drained
20a.
Poorly Drained to very poorly-drained and NOT mapunits labelled “ponded” - Wet Alluvial Flats… F120AY020KY
... F120AY020KY – Wet Alluvial Flats
20b.
“Ponded” labelled mapunits: - Ponded Alluvial Flats… F120AY022KY
... F120AY022KY – Ponded Alluvial Flats
1b.
Human Transported material or Mine Spoils
21a.
Not poorly-drained or very poorly-drained - RESERVED
21b.
Poorly- drained or very poorly-drained - RESERVED
MLRA 120A
I.
Uplands
A.
Formed in Loess
D.
No Fragipan
IV.
Terraces
A.
Well Drained and Moderately Well Drained
... F120AY011KY – Well Drained And Moderately Well Drained Terraces
V.
Floodplains
B.
Well Drained Floodplains
C.
Somewhat poorly drained to Moderately Well Drained Floodplains
... F120AY019KY – Moist Silty Alluvium
D.
Poorly Drained
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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