Major Land Resource Area 048A

Southern Rocky Mountains

Accessed: 12/28/2024

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Land Resource Regions and Major Land Resource Areas of the United States, the Caribbean, and the Pacific Basin

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Ecological site group list

Provisional

ESG048A18

Saline Bottoms
i
Key Characteristics
1. Additional water
2. Ephemeral water
3. Subsurface EC >4 - 28 soil components
4. Additional water
5. Ephemeral water
6. Subsurface EC >4 - 28 soil components
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Provisional

ESG048A20

Bottoms
i
Key Characteristics
1. Additional water
2. Ephemeral water
3. Subsurface EC <4
4. Sand <50% & Clay >25% for surface and subsurface - 89 soil components
5. Additional water
6. Ephemeral water
7. Subsurface EC <4 - 98 soil components
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Provisional

ESG048A21

Outcrops
i
Key Characteristics
1. Uplands
2. >75% bedrock outcrop - 527 soil components
3. Uplands
4. >75% bedrock outcrop - 527 soil components
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Provisional

ESG048A22

Saline Hills
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR >8, or Subsurface EC >8, or Surface EC >4 - 93 soil components
4. Uplands
5. <75% bedrock outcrop
6. Surface SAR >8, subsurface EC >8, or surface EC >4, and soil moisture regime udic or ustic - 64 soil components
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Provisional

ESG048A24

Saline Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC >1.5 surface or >2 subsurface - 42 soil components
6. Uplands
7. <75% bedrock outcrop
8. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
9. EC>1.5 surface or >2 subsurface - 42 soil components
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Provisional

ESG048A25

Breaks
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface or <2 subsurface
6. slope >35% & >40% surface rock - 34 soil components
7. Uplands
8. <75% bedrock outcrop
9. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
10. EC<1.5 surface or <2 subsurface
11. slope >35% & >40% surface rock AND soil moisture regime of Udic or Ustic - 34 soil components
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Provisional

ESG048A26

Very Shallow
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface or <2 subsurface
6. slope <35% or <40% surface rock
7. Depth <30cm - 1211 soil components
8. Uplands
9. <75% bedrock outcrop
10. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
11. EC<1.5 surface or <2 subsurface
12. Depth <30 cm AND soil moisture regime of Udic or Ustic - 1170 soil components
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Provisional

ESG048A27

Shallow
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface or <2 subsurface
6. slope <35% or <40% surface rock
7. depth: 30-55cm - 717 soil components
8. Uplands
9. <75% bedrock outcrop
10. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
11. EC<1.5 surface or <2 subsurface
12. Depth: 30-55 cm AND soil moisture regime of Udic or Ustic - 694 soil components
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Provisional

ESG048A28

Deep Rocky
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface or <2 subsurface
6. slope <35% or <40% surface rock
7. depth >55cm
8. Rock >30% surface or >30% subsurface - 628 soil components
9. Uplands
10. <75% bedrock outcrop
11. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
12. EC<1.5 surface or <2 subsurface
13. Rock >30% surface or >30% subsurface AND soil moisture regime of Udic or Ustic - 621 soil components
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Provisional

ESG048A30

Sandy Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface or <2 subsurface
6. slope <35% or <40% surface rock
7. depth >55cm
8. Rock <30% surface and <30% subsurface
9. Clay <30% surface and <35% subsurface
10. sand >75% or texture is Loamy Sand or sandier in surface & subsurface - 21 soil components
11. Uplands
12. <75% bedrock outcrop
13. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
14. EC<1.5 surface or <2 subsurface
15. Soil not steep, rocky, or shallow
16. Clay >30% surface or >35% subsurface
17. sand >75% or texture is loamy sand or sandier in surface & subsurface - 21 soil components
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Provisional

ESG048A31

Loamy Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface or <2 subsurface
6. slope <35% or <40% surface rock
7. depth >55cm
8. Rock <30% surface and <30% subsurface
9. Clay <30% surface and <35% subsurface
10. sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface
11. Clay <20% or texture is Sandy Loam or sandier in surface - 993 soil components
12. Uplands
13. <75% bedrock outcrop
14. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
15. EC<1.5 surface or <2 subsurface
16. Soil not steep, rocky, or shallow
17. Clay >30% surface or >35% subsurface
18. sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface
19. Clay <20%or texture is Sandy Loam or sandier in surface - 993 soil components
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Provisional

ESG048A33

Mineral Riparian
i
Key Characteristics
1. Additional water
2. Perennial water
3. Mineral soil surface - 68 soil components
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Provisional

ESG048A34

Organic Riparian
i
Key Characteristics
1. Additional water
2. Perennial water
3. Organic soil surface - 40 soil components
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Provisional

ESG048A35

Arid/Gypsic Saline Hills
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. (Gypsum >5% surface or >10% subsurface) OR (surface SAR >8 or subsurface EC>8 or surface EC>4 AND soil moisture regime is aridic) - 56 soil components
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Provisional

ESG048A36

Aridic Shallow or Rocky
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
4. EC<1.5 surface or <2 subsurface
5. Slope, rock, or depth meeting one of the four criteria above, but with an Aridic soil moisture regime - 71 soil components
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Provisional

ESG048A37

Udic Clay Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
4. EC<1.5 surface or <2 subsurface
5. Soil not steep, rocky, or shallow
6. Clay >30% surface or >35% subsurface AND Udic soil moisture regime - 216 soil components
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Provisional

ESG048A38

Ustic Clay Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
4. EC<1.5 surface or <2 subsurface
5. Soil not steep, rocky, or shallow
6. Clay >30% surface or >35% subsurface AND Ustic soil moisture regime - 370 soil components
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Provisional

ESG048A39

Aridic Clay Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
4. EC<1.5 surface or <2 subsurface
5. Soil not steep, rocky, or shallow
6. Clay >30% surface or >35% subsurface AND Aridic soil moisture regime - 69 soil components
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Provisional

ESG048A40

Udic Finer Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
4. EC<1.5 surface or <2 subsurface
5. Soil not steep, rocky, or shallow
6. Clay >30% surface or >35% subsurface
7. sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface
8. Clay >20% or texture is Fine Sandy Loam or finer in surface AND Udic soil moisture regime - 411 soil components
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Provisional

ESG048A41

Ustic Finer Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
4. EC<1.5 surface or <2 subsurface
5. Soil not steep, rocky, or shallow
6. Clay >30% surface or >35% subsurface
7. sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface
8. Clay >20% or texture is Fine Sandy Loam or finer in surface AND Ustic soil moisture regime - 343 soil components
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Provisional

ESG048A42

Aridic Finer Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.
4. EC<1.5 surface or <2 subsurface
5. Soil not steep, rocky, or shallow
6. Clay >30% surface or >35% subsurface
7. sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface
8. Clay >20% or texture is Fine Sandy Loam or finer in surface AND Aridic soil moisture regime - 96 soil components
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Ecological site group keys

MLRA 48A ESGs - Curtis strawman

I. Aquic Moisture Regime

A. Cryic Temperature Regime

1 Mineral Soil - 117 soil components ... ESG048A01 – Aquic Cryic Mineral

2 Organic Soil - 43 soil components ... ESG048A02 – Aquic Cryic Organic

B. Frigid Temperature Regime - 48 soil components ... ESG048A03 – Aquic Frigid

II. Udic Moisture Regime

A. Pergelic Temperature Regime - 13 soil components ... ESG048A04 – Udic Pergelic

B. Cryic Temperature Regime

1 Sandy Surface Texture - 24 soil components ... ESG048A05 – Udic Cryic Sandy

2 Loamy Surface Texture

i. No coarse fragments on the surface - 764 soil components ... ESG048A06 – Udic Cryic Loamy

ii. Gravelly Surface - 450 soil components ... ESG048A07 – Udic Cryic Gravelly

iii. Coarse fragments larger than gravel on the surface - 699 soil components ... ESG048A08 – Udic Cryic Stony

C. Frigid Temperature Regime - 372 soil components ... ESG048A09 – Udic Frigid

III. Ustic Moisture Regime

A. Cryic Temperature Regime

1 No coarse fragments on the surface - 187 soil components ... ESG048A10 – Ustic Cryic

2 Coarse fragments on the surface - 174 soil components ... ESG048A11 – Ustic Cryic Gravelly

B. Frigid Temperature Regime

1 No coarse fragments on the surface - 497 soil components ... ESG048A12 – Ustic Frigid

2 Coarse fragments on the surface - 708 soil components ... ESG048A13 – Ustic Frigid Gravelly

C. Mesic Temperature Regime - 87 soil components ... ESG048A14 – Ustic Mesic

IV. Aridic Moisture Regime

A. Frigid Temperature Regime - 74 soil components ... ESG048A15 – Aridic Frigid

B. Mesic Temperature Regime - 38 soil components ... ESG048A16 – Aridic Mesic

MLRA 48A ESGs - Travis strawman

I. Additional water

A. Perennial water - 109 soil components ... ESG048A17 – Riparian

B. Ephemeral water

1 Subsurface EC >4 - 28 soil components ... ESG048A18 – Saline Bottoms

2 Subsurface EC <4

i. Sand >50% & Clay <25% for surface and subsurface - 9 soil components ... ESG048A19 – Sandy Bottoms

ii. Sand <50% & Clay >25% for surface and subsurface - 89 soil components ... ESG048A20 – Bottoms

II. Uplands

A. >75% bedrock outcrop - 527 soil components ... ESG048A21 – Outcrops

B. <75% bedrock outcrop

1 Surface SAR >8, or Subsurface EC >8, or Surface EC >4 - 93 soil components ... ESG048A22 – Saline Hills

2 Surface SAR <8, or Subsurface EC <8, or Surface EC <4

i. Gypsum >5% surface or >10% subsurface - 27 soil components ... ESG048A23 – Gypsum

ii. Gypsum <5% surface and <10% subsurface

a. EC >1.5 surface or >2 subsurface - 42 soil components ... ESG048A24 – Saline Uplands

b. EC <1.5 surface or <2 subsurface

1) slope >35% & >40% surface rock - 34 soil components ... ESG048A25 – Breaks

2) slope <35% or <40% surface rock

a) Depth <30cm - 1211 soil components ... ESG048A26 – Very Shallow

b) depth: 30-55cm - 717 soil components ... ESG048A27 – Shallow

c) depth >55cm

(1) Rock >30% surface or >30% subsurface - 628 soil components ... ESG048A28 – Deep Rocky

(2) Rock <30% surface and <30% subsurface

(a) Clay >30% surface or >35% subsurface - 655 soil components ... ESG048A29 – Clay Uplands

(b) Clay <30% surface and <35% subsurface

(1) sand >75% or texture is Loamy Sand or sandier in surface & subsurface - 21 soil components ... ESG048A30 – Sandy Uplands

(2) sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface

(a) Clay <20% or texture is Sandy Loam or sandier in surface - 993 soil components ... ESG048A31 – Loamy Uplands

(b) Clay >20% or texture is Fine Sandy Loam or finer in surface - 977 soil components ... ESG048A32 – Finer Uplands

3rd Iteration

I. Additional water

A. Perennial water

1 Mineral soil surface - 68 soil components ... ESG048A33 – Mineral Riparian

2 Organic soil surface - 40 soil components ... ESG048A34 – Organic Riparian

B. Ephemeral water

1 Subsurface EC >4 - 28 soil components ... ESG048A18 – Saline Bottoms

2 Subsurface EC <4 - 98 soil components ... ESG048A20 – Bottoms

II. Uplands

A. >75% bedrock outcrop - 527 soil components ... ESG048A21 – Outcrops

B. <75% bedrock outcrop

1 Surface SAR >8, subsurface EC >8, or surface EC >4, and soil moisture regime udic or ustic - 64 soil components ... ESG048A22 – Saline Hills

2 (Gypsum >5% surface or >10% subsurface) OR (surface SAR >8 or subsurface EC>8 or surface EC>4 AND soil moisture regime is aridic) - 56 soil components ... ESG048A35 – Arid/Gypsic Saline Hills

3 Gypsum <5% surface, gypsum <10% subsurface, surface SAR <8, subsurface EC <8, and surface EC <4.

i. EC>1.5 surface or >2 subsurface - 42 soil components ... ESG048A24 – Saline Uplands

ii. EC<1.5 surface or <2 subsurface

a. slope >35% & >40% surface rock AND soil moisture regime of Udic or Ustic - 34 soil components ... ESG048A25 – Breaks

b. Depth <30 cm AND soil moisture regime of Udic or Ustic - 1170 soil components ... ESG048A26 – Very Shallow

c. Depth: 30-55 cm AND soil moisture regime of Udic or Ustic - 694 soil components ... ESG048A27 – Shallow

d. Rock >30% surface or >30% subsurface AND soil moisture regime of Udic or Ustic - 621 soil components ... ESG048A28 – Deep Rocky

e. Slope, rock, or depth meeting one of the four criteria above, but with an Aridic soil moisture regime - 71 soil components ... ESG048A36 – Aridic Shallow or Rocky

f. Soil not steep, rocky, or shallow

1) Clay >30% surface or >35% subsurface AND Udic soil moisture regime - 216 soil components ... ESG048A37 – Udic Clay Uplands

2) Clay >30% surface or >35% subsurface AND Ustic soil moisture regime - 370 soil components ... ESG048A38 – Ustic Clay Uplands

3) Clay >30% surface or >35% subsurface AND Aridic soil moisture regime - 69 soil components ... ESG048A39 – Aridic Clay Uplands

4) Clay >30% surface or >35% subsurface

a) sand >75% or texture is loamy sand or sandier in surface & subsurface - 21 soil components ... ESG048A30 – Sandy Uplands

b) sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface

(1) Clay <20%or texture is Sandy Loam or sandier in surface - 993 soil components ... ESG048A31 – Loamy Uplands

(2) Clay >20% or texture is Fine Sandy Loam or finer in surface AND Udic soil moisture regime - 411 soil components ... ESG048A40 – Udic Finer Uplands

(3) Clay >20% or texture is Fine Sandy Loam or finer in surface AND Ustic soil moisture regime - 343 soil components ... ESG048A41 – Ustic Finer Uplands

(4) Clay >20% or texture is Fine Sandy Loam or finer in surface AND Aridic soil moisture regime - 96 soil components ... ESG048A42 – Aridic Finer Uplands

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