Natural Resources
Conservation Service
Major Land Resource Area 036X
Major Land Resource Area
Accessed: 06/17/2026
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Select an ecological site group using the list, keys, photos, briefcase, or quick search option located on this page. -
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Explore the ecological site group description
Next, learn more about the selected ecological site group and its characteristic dynamics by browsing the ecological site group description and exploring alternative state and transition model formats.
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Viewing 20 of 28
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i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
-
i
Key Characteristics
- Site located south of the Columbia River.
- . Located within Crater Lake National Park Refer to LRU F (or 6) Key (Mazama Cascades).
- Site located within Crater Lake National Park
- Located below timberline
- . Basins where microclimate is harsh
- microclimate allows forested communities HC High Pumice Basin (F003XY707OR)
Briefcase
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Ecological site groups
Major Land Resource Areas
Ecological site group photos
Tools
Filter by
interactive key
clear all
Type
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Done
Filters
Interactive key
>75% bedrock outcrop
036XESG08 – Outcrops
036XESG08 – Outcrops
<75% bedrock outcrop
Perennial water
036XESG09 – Riparian
036XESG09 – Riparian
Ephemeral water or uplands
Aridic moisture regime
Ustic or udic moisture regimes
Cryic, frigid, or mesic temperature regimes
Thermic temperature regime
036XESG28 – Arid Warm Saline Uplands
036XESG28 – Arid Warm Saline Uplands
Additional water
036XESG24 – Arid Cool Sandy Bottoms
036XESG24 – Arid Cool Sandy Bottoms
Uplands
Surface SAR >8
036XESG22 – Arid Cool Saline Hills
036XESG22 – Arid Cool Saline Hills
Surface SAR <8
Gypsum >5% surface or >10% subsurface
036XESG20 – Arid Cool Gypsum
036XESG20 – Arid Cool Gypsum
Gypsum <5% surface and <10% subsurface
Subsurface EC >8 or surface EC >4
036XESG22 – Arid Cool Saline Hills
036XESG22 – Arid Cool Saline Hills
Subsurface EC <8 and surface EC <4
EC >1.5 surface or >2 subsurface
036XESG23 – Arid Cool Saline Uplands
036XESG23 – Arid Cool Saline Uplands
EC <1.5 surface and <2 subsurface
Slope >35% & >40% surface rock
036XESG16(17919) – Arid Cool Breaks
036XESG16(17919) – Arid Cool Breaks
Slope <35% or <40% surface rock
Depth <30cm
036XESG27 – Arid Cool Very Shallow
036XESG27 – Arid Cool Very Shallow
Depth: 30-55cm
036XESG26 – Arid Cool Shallow
036XESG26 – Arid Cool Shallow
Depth >55cm
Rock >30% surface or >30% subsurface
036XESG18 – Arid Cool Deep Rocky
036XESG18 – Arid Cool Deep Rocky
Rock <30% surface and <30% subsurface
Clay >30% surface or >35% subsurface
036XESG17 – Arid Cool Clay Uplands
036XESG17 – Arid Cool Clay Uplands
Clay <30% surface and <35% subsurface
Sand >75% or texture is loamy sand or sandier in surface & subsurface
036XESG25 – Arid Cool Sandy Uplands
036XESG25 – Arid Cool Sandy Uplands
Sand <75% or texture is sandy loam or finer in surface & subsurface
Clay <20% or texture is sandy loam or sandier in surface
036XESG21 – Arid Cool Loamy Uplands
036XESG21 – Arid Cool Loamy Uplands
Clay >20% or texture is finer than sandy loam in surface
036XESG19 – Arid Cool Finer Uplands
036XESG19 – Arid Cool Finer Uplands
Cryic, frigid, or mesic temperature regimes
Thermic temperature regime
Additional water
Uplands
Sand >50% % clay <25% for surface and subsurface
036XESG36(18013) – Semiarid Cool Sandy Bottoms
036XESG36(18013) – Semiarid Cool Sandy Bottoms
Sand <50% or clay >25% for surface and subsurface
036XESG29 – Semiarid Cool Bottoms
036XESG29 – Semiarid Cool Bottoms
Surface SAR >8
036XESG34 – Semiarid Cool Saline Hills
036XESG34 – Semiarid Cool Saline Hills
Surface SAR <8
Gypsum >5% surface or >10% subsurface
036XESG33 – Semiarid Cool Gypsum
036XESG33 – Semiarid Cool Gypsum
Gypsum <5% and <10% subsurface
Subsurface EC >8 or surface EC >4
036XESG34 – Semiarid Cool Saline Hills
036XESG34 – Semiarid Cool Saline Hills
Subsurface EC <8 and surface EC <4
EC >1.5 surface or >2 subsurface
036XESG35 – Semiarid Cool Saline, Sandy, Loamy, and Finer Uplands
036XESG35 – Semiarid Cool Saline, Sandy, Loamy, and Finer Uplands
EC <1.5 surface and <2 subsurface
Slope >35% & >40% surface rock
036XESG30 – Semiarid Cool Breaks
036XESG30 – Semiarid Cool Breaks
Slope <35% or <40% surface rock
Depth <30cm
036XESG38 – Semiarid Cool Very Shallow
036XESG38 – Semiarid Cool Very Shallow
Depth: 30-55cm
036XESG37 – Semiarid Cool Shallow
036XESG37 – Semiarid Cool Shallow
Depth >55cm
Rock >30% surface or >30% subsurface
036XESG32 – Semiarid Cool Deep Rocky
036XESG32 – Semiarid Cool Deep Rocky
Rock <30% surface and <30% subsurface
Clay >30% surface or >35% subsurface
036XESG31 – Semiarid Cool Clay Uplands
036XESG31 – Semiarid Cool Clay Uplands
Clay <30% surface and <35% subsurface
036XESG35 – Semiarid Cool Saline, Sandy, Loamy, and Finer Uplands
036XESG35 – Semiarid Cool Saline, Sandy, Loamy, and Finer Uplands
EC >1.5 surface or >2 subsurface
036XESG40 – Semiarid Warm Saline Uplands
036XESG40 – Semiarid Warm Saline Uplands
EC <1.5 surface and <2 subsurface
Depth <55cm
036XESG41 – Semiarid Warm Shallow and Deep Rocky
036XESG41 – Semiarid Warm Shallow and Deep Rocky
Depth >55cm
Rock >30% surface or >30% subsurface
036XESG41 – Semiarid Warm Shallow and Deep Rocky
036XESG41 – Semiarid Warm Shallow and Deep Rocky
Rock <30% surface and <30% subsurface
036XESG39 – Semiarid Warm Clay Uplands
036XESG39 – Semiarid Warm Clay Uplands
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Ecological site group keys
MLRA 36
II.
<75% bedrock outcrop
B.
Ephemeral water or uplands
1
Aridic moisture regime
i.
Cryic, frigid, or mesic temperature regimes
b.
Uplands
2)
Surface SAR <8
b)
Gypsum <5% surface and <10% subsurface
(2)
Subsurface EC <8 and surface EC <4
(b)
EC <1.5 surface and <2 subsurface
(2)
Slope <35% or <40% surface rock
(c)
Depth >55cm
(2)
Rock <30% surface and <30% subsurface
(b)
Clay <30% surface and <35% subsurface
(1)
Sand >75% or texture is loamy sand or sandier in surface & subsurface
... 036XESG25 – Arid Cool Sandy Uplands
(2)
Sand <75% or texture is sandy loam or finer in surface & subsurface
(a)
Clay <20% or texture is sandy loam or sandier in surface
... 036XESG21 – Arid Cool Loamy Uplands
(b)
Clay >20% or texture is finer than sandy loam in surface
... 036XESG19 – Arid Cool Finer Uplands
2
Ustic or udic moisture regimes
i.
Cryic, frigid, or mesic temperature regimes
a.
Additional water
1)
Sand >50% % clay <25% for surface and subsurface
... 036XESG36(18013) – Semiarid Cool Sandy Bottoms
b.
Uplands
2)
Surface SAR <8
b)
Gypsum <5% and <10% subsurface
(2)
Subsurface EC <8 and surface EC <4
(a)
EC >1.5 surface or >2 subsurface
... 036XESG35 – Semiarid Cool Saline, Sandy, Loamy, and Finer Uplands
(b)
EC <1.5 surface and <2 subsurface
(2)
Slope <35% or <40% surface rock
(c)
Depth >55cm
(2)
Rock <30% surface and <30% subsurface
(b)
Clay <30% surface and <35% subsurface
... 036XESG35 – Semiarid Cool Saline, Sandy, Loamy, and Finer Uplands
ii.
Thermic temperature regime
b.
EC <1.5 surface and <2 subsurface
2)
Depth >55cm
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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