Major Land Resource Area 104X

Eastern Iowa and Minnesota Till Prairies

Accessed: 12/21/2024

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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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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.

Ecological site keys

MLRA 104 Key to Provisional Ecological Sites

I. Uplands

A. Histosols ... R104XY001IA – Organic Sedge Meadow

B. Mineral Soils

1 Summits, Shoulders & Backslopes

i. Shallow (≤100cm) loamy sediments over bedrock

a. Mollisols

1) Deep to water table (≥12 inches (≥30cm)) ... R104XY002IA – Bedrock Prairie

2) Shallow to water table (≤12 inches ≤30cm)) ... R104XY003IA – Wet Bedrock Prairie

b. Alfisols ... F104XY004IA – Bedrock Woodland

ii. Loess or Loamy Sediments over Glacial Till

a. Mollisols

1) Deep to the water table (≥30 cm) ... R104XY005IA – Loamy Upland Prairie

2) Shallow to water table (≤30cm) ... R104XY006IA – Wet Loamy Upland Prairie

b. Mollic subgroup of an Alfisols

1) Deep to the water table (≥30cm) ... R104XY007IA – Loamy Upland Savanna

2) Shallow to the water table (≤30cm) ... R104XY008IA – Wet Loamy Upland Savanna

c. Alfisols ... F104XY009IA – Loamy Upland Woodland

iii. Eolian sands

a. Mollisols ... R104XY010IA – Sandy Upland Prairie

b. Mollic subgroup of an Alfisols ... R104XY011IA – Sandy Upland Savanna

2 Drainageways ... R104XY012IA – Wet Upland Drainageway Sedge Meadow

3 Depressions ... R104XY013IA – Ponded Upland Depression Sedge Meadow

II. River Valleys

A. Histosols (go to I.A.)

B. Mineral soils

1 Low Stream Terraces

i. Deep to water table (≥30cm), SWP to SWE-drained ... R104XY015IA – Terrace Savanna

ii. Shallow to water table (≤30cm), VP to P-drained ... R104XY016IA – Wet Terrace Sedge Meadow

2 Floodplains

i. Flooded & ponded ... R104XY014IA – Ponded Floodplain Marsh

ii. Flooded only

a. Not directly adjacent to stream channel

1) Deep to water table (≥30cm) ... R104XY017IA – Floodplain Prairie

2) Shallow to water table (≤30cm) ... R104XY018IA – Wet Floodplain Sedge Meadow

b. Directly adjacent to stream channel

1) Fine, fine-silty alluvium, P to VP-drained ... F104XY019IA – Floodplain Swamp Forest

2) Fine-loamy, fine-silty alluvium, SWP to MW-drained ... F104XY020IA – Loamy Floodplain Forest

3) Coarse-loamy alluvium, W to E-drained ... F104XY021IA – Sandy Floodplain Forest

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