Natural Resources
Conservation Service
ecological site group ESG048A38
Ustic Clay Uplands
Accessed: 08/28/2026
Ecological site group description
Key Characteristics
- Uplands
- <75% bedrock outcrop
- Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
- EC<1.5 surface or <2 subsurface
- Soil not steep, rocky, or shallow
- Clay >30% surface or >35% subsurface AND Ustic soil moisture regime - 370 soil components
Provisional. An approved ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model, enough information to identify the ecological site, and full documentation for all ecosystem states contained in the state and transition model.
Physiography
This ESG is located on hills, mountainsides, and valley sides.
Climate
This ESG is characterized by the ustic soil moisture regime.
Soil features
This ESG is characterized by clay >30% surface or >35% subsurface.
Vegetation dynamics
The modal ecological site for this ESG is R048AY247CO - Deep Clay Loam.
Major Land Resource Area
MLRA 048A
Southern Rocky Mountains
Subclasses
- F048AY439UT–Mountain Shallow Loam (Ponderosa pine)
- F048AY449CO–Aspen Woodland
- F048AY908CO–Mixed Conifer
- F048AY912CO–Lodgepole Pine
- F048AY918CO–Spruce-Fir Woodland
- F048AY925CO–Ponderosa Pine Forest
- R048AA228CO–Mountain Loam Gunnison Basin LRU
- R048AA241CO–Mountain Meadow Gunnison Basin LRU
- R048AA250CO–Subalpine Loam Gunnison Basin LRU
- R048AY001NM–Subalpine Grassland
- R048AY002NM–Mountain Grassland
- R048AY003NM–Mountain Valley
- R048AY004NM–Mountain Loam
- R048AY005NM–Mountain Malpais
- R048AY006NM–Mountain Meadow
- R048AY007NM–Mountain Shale
- R048AY012NM–Mountain Loam Dry
- R048AY014NM–Mountain Valley Dry
- R048AY222CO–Loamy Park
- R048AY228CO–Mountain Loam
- R048AY234CO–Mountain Clay
- R048AY237CO–Stony Loam
- R048AY238CO–Brushy Loam
- R048AY241CO–Mountain Meadow
- R048AY244CO–Mountain Shale
- R048AY245CO–Mountain Swale
- R048AY247CO–Deep Clay Loam
- R048AY248CO–Mountain Clay Loam
- R048AY250CO–Subalpine Loam
- R048AY252CO–Subalpine Clay
- R048AY292CO–Deep Loam
- R048AY303CO–Loamy Slopes
- R048AY306UT–Upland Loam (Wyoming Big Sagebrush)
- R048AY405UT–Mountain Loam (Mountain Big Sagebrush)
- R048AY415UT–Mountain Loam (Oak)
- R048AY417UT–Mountain Loam (Ponderosa Pine)
- R048AY448UT–Mountain Stony Loam (Mountain Big Sagebrush)
- R048AY451UT–Mountain Stony Loam (Browse)
- R048AY503UT–High Mountain Clay
Correlated Map Unit Components
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Stage
Approved
Contributors
Travis Nauman
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