Natural Resources
Conservation Service
Major Land Resource Area 034A
Major Land Resource Area
Accessed: 04/21/2026
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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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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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
-
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
- Otherwise; forested communities typical
- Otherwise
- High-elevation sites; natural fire regime is stand-replacing, estimated fire return interval >200 years; mountain hemlock forest typical
- . South-facing slopes; droughty in summer High Cascades Dry (F003XY705OR)
Briefcase
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Ecological site groups
Major Land Resource Areas
Ecological site group photos
Tools
Filter by
interactive key
clear all
Type
Image size
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Filters
Interactive key
>75% bedrock outcrop
034AESG07 – Outcrops
034AESG07 – Outcrops
<75% bedrock outcrop
Perennial water
034AESG08 – Riparian
034AESG08 – Riparian
Ephemeral water or uplands
Aridic moisture regime
Udic, ustic, and xeric moisture regimes
Ephemeral water
Uplands
Subsurface EC >4
034AESG22 – Arid Cool Saline Bottoms
034AESG22 – Arid Cool Saline Bottoms
Subsurface EC <4
034AESG16 – Arid Cool Bottoms
034AESG16 – Arid Cool Bottoms
Surface SAR >8
034AESG23 – Arid Cool Saline Hills
034AESG23 – Arid Cool Saline Hills
Surface SAR <8
Gypsum >5% surface or >10% subsurface
034AESG20 – Arid Cool Gypsum
034AESG20 – Arid Cool Gypsum
Gypsum <5% surface and <10% subsurface
Subsurface EC >8 or surface EC >4
034AESG23 – Arid Cool Saline Hills
034AESG23 – Arid Cool Saline Hills
Subsurface EC <8 and surface EC <4
EC >1.5 surface or >2 subsurface
034AESG24 – Arid Cool Saline Uplands
034AESG24 – Arid Cool Saline Uplands
EC <1.5 surface and <2 subsurface
Depth <30cm
034AESG27 – Arid Cool Very Shallow
034AESG27 – Arid Cool Very Shallow
Depth: 30-55cm
034AESG26 – Arid Cool Shallow
034AESG26 – Arid Cool Shallow
Depth >55cm
Rock >30% surface or >30% subsurface
034AESG18 – Arid Cool Deep Rocky
034AESG18 – Arid Cool Deep Rocky
Rock <30% surface and <30% subsurface
Clay >30% surface or >35% subsurface
034AESG17 – Arid Cool Clay Uplands
034AESG17 – Arid Cool Clay Uplands
Clay <30% surface and <35% subsurface
Sand >75% or texture is loamy sand or sandier in surface & subsurface
034AESG25 – Arid Cool Sandy Uplands
034AESG25 – 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
034AESG21 – Arid Cool Loamy Uplands
034AESG21 – Arid Cool Loamy Uplands
Clay >20% or texture is finer than sandy loam in surface
034AESG19 – Arid Cool Finer Uplands
034AESG19 – Arid Cool Finer Uplands
Ephemeral water
Uplands
Subsurface EC >4
034AESG32 – Semiarid Cool Saline Bottoms
034AESG32 – Semiarid Cool Saline Bottoms
Subsurface EC <4
Sand >50% & clay <25% for surface and subsurface
034AESG35 – Semiarid Cool Sandy Bottoms
034AESG35 – Semiarid Cool Sandy Bottoms
Sand <50% or clay >25% for surface and subsurface
034AESG28 – Semiarid Cool Bottoms
034AESG28 – Semiarid Cool Bottoms
Surface SAR >8
034AESG33 – Semiarid Cool Saline Hills
034AESG33 – Semiarid Cool Saline Hills
Surface SAR <8
Gypsum >5% surface or >10% subsurface
034AESG31 – Semiarid Cool Gypsum
034AESG31 – Semiarid Cool Gypsum
Gypsum <5% surface and <10% subsurface
Subsurface EC >8 or surface EC >4
034AESG33 – Semiarid Cool Saline Hills
034AESG33 – Semiarid Cool Saline Hills
Subsurface EC <8 and surface EC <4
EC >1.5 surface or >2 subsurface
034AESG34 – Semiarid Cool Saline Uplands, Sandy Uplands, Loamy Uplands, & Finer Uplands
034AESG34 – Semiarid Cool Saline Uplands, Sandy Uplands, Loamy Uplands, & Finer Uplands
EC <1.5 surface and <2 subsurface
Depth <30cm
034AESG37 – Semiarid Cool Very Shallow
034AESG37 – Semiarid Cool Very Shallow
Depth: 30-55cm
034AESG36 – Semiarid Cool Shallow
034AESG36 – Semiarid Cool Shallow
Depth >55cm
Rock >30% surface or >30% subsurface
034AESG30 – Semiarid Cool Deep Rocky
034AESG30 – Semiarid Cool Deep Rocky
Rock <30% surface and <30% subsurface
Clay >30% surface or >35% subsurface
034AESG29 – Semiarid Cool Clay Uplands
034AESG29 – Semiarid Cool Clay Uplands
Clay <30% surface or <35% subsurface
034AESG34 – Semiarid Cool Saline Uplands, Sandy Uplands, Loamy Uplands, & Finer Uplands
034AESG34 – Semiarid Cool Saline Uplands, Sandy Uplands, Loamy Uplands, & Finer Uplands
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Ecological site group keys
MLRA 34A
II.
<75% bedrock outcrop
B.
Ephemeral water or uplands
1
Aridic moisture regime
i.
Ephemeral water
ii.
Uplands
b.
Surface SAR <8
2)
Gypsum <5% surface and <10% subsurface
b)
Subsurface EC <8 and surface EC <4
(2)
EC <1.5 surface and <2 subsurface
(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
... 034AESG25 – 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
... 034AESG21 – Arid Cool Loamy Uplands
(b)
Clay >20% or texture is finer than sandy loam in surface
... 034AESG19 – Arid Cool Finer Uplands
2
Udic, ustic, and xeric moisture regimes
i.
Ephemeral water
b.
Subsurface EC <4
ii.
Uplands
b.
Surface SAR <8
2)
Gypsum <5% surface and <10% subsurface
b)
Subsurface EC <8 and surface EC <4
(1)
EC >1.5 surface or >2 subsurface
... 034AESG34 – Semiarid Cool Saline Uplands, Sandy Uplands, Loamy Uplands, & Finer Uplands
(2)
EC <1.5 surface and <2 subsurface
(c)
Depth >55cm
(2)
Rock <30% surface and <30% subsurface
(b)
Clay <30% surface or <35% subsurface
... 034AESG34 – Semiarid Cool Saline Uplands, Sandy Uplands, Loamy Uplands, & Finer Uplands
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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