Soil Survey of McHenry County, Illinois Part I - Soil Data Mart

McHenry County, Illinois—Part I 95
A typical soil series description with range in
characteristics is included, in alphabetical order, in this
section. Additional information specific to this map
unit, such as horizon depth and textures, is available
in the “Soil Properties” section in Part II of this
publication.
Composition
Millbrook and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that have a seasonal high water table at a
depth of more than 2.5 feet
• soils that have a darker subsurface layer
• soils that contain sandy and gravelly deposits in the
lower part of the profile
• soils that contain loamy outwash at a depth of more
than 40 inches
Dissimilar soils:
• the well drained Harvard and Proctor soils in the
higher positions on the landform
• the poorly drained Pella soils in depressions and
drainageways
Management
For general and detailed information about
managing this map unit, see the following sections in
Part II of this publication:
• “Agronomy” section
• “Forestland” section
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section
Millington Series
Drainage class: Poorly drained
Permeability: Moderate
Landform: Flood plains
Parent material: Calcareous loamy alluvium
Slope range: 0 to 2 percent
Taxonomic classification: Fine-loamy, mixed,
calcareous, mesic Cumulic Endoaquolls
Typical Pedon for MLRA 95B
Typical pedon of Millington silt loam, 0 to 2 percent
slopes, undrained, occasionally flooded, 850 feet north
and 1,050 feet east of the southwest corner of sec. 27,
T. 46 N., R. 8 E.
A1—0 to 8 inches; black (10YR 2/1) silt loam, dark
gray (10YR 4/1) dry; moderate fine and medium
granular structure; friable; many very fine roots;
about 25 percent sand; 4 percent fine snail-shell
fragments; violently effervescent; moderately
alkaline; clear smooth boundary.
A2—8 to 14 inches; black (N 2.5/0) silt loam, very dark
gray (10YR 3/1) dry; weak medium subangular
blocky structure parting to moderate medium
granular; friable; many very fine roots; about 25
percent sand; 5 percent fine snail-shell fragments;
violently effervescent; moderately alkaline; clear
smooth boundary.
A3—14 to 21 inches; black (10YR 2/1) silt loam; weak
fine and medium subangular blocky structure
parting to moderate medium granular; friable;
common very fine roots; about 15 percent sand;
common distinct black (N 2.5/0) organic coatings
on faces of peds and in pores; 6 percent fine
snail-shell fragments; common fine prominent
dark brown (7.5YR 3/3) masses of iron
accumulation in the matrix; violently effervescent;
moderately alkaline; clear smooth boundary.
Bg—21 to 37 inches; very dark gray (2.5Y 3/1) silt
loam; weak medium subangular blocky structure;
friable; common very fine roots; about 20 percent
sand; few distinct black (N 2.5/0) organic coatings
on faces of peds and in pores; 1 percent fine
snail-shell fragments; common fine and medium
distinct dark olive brown (2.5Y 3/3) masses of
iron accumulation in the matrix; strongly
effervescent; moderately alkaline; clear smooth
boundary.
Cg—37 to 60 inches; 55 percent dark grayish brown
(2.5Y 4/2), 30 percent light brownish gray (2.5Y
6/2), and 15 percent yellowish brown (10YR 5/6),
stratified loam, silt loam, and sandy loam;
massive; friable; common very fine roots; few
distinct black (10YR 2/1) organic coatings in root
channels and in pores; 1 percent gravel; slightly
effervescent; slightly alkaline.
MLRA Series Range in Characteristics
Thickness of the mollic epipedon: 24 to 40 inches
Depth to carbonates: Less than 10 inches
Thickness of the solum: 24 to 48 inches
Ap or A horizon:
Hue—10YR, 2.5Y, or N
Value—2 or 3
Chroma—0 to 2
Texture—silt loam, loam, silty clay loam, or clay
loam
Bg horizon:
Hue—10YR, 2.5Y, 5Y, or N
Value—3 to 5
Chroma—0 to 2