Soil Survey of Sweet Grass County Area, Montana - Soil Data Mart

124 Soil Survey
C horizon
Hue: 10YR or 2.5Y
Value: 4 to 6 dry; 3 or 4 moist
Chroma: 2 or 3
Texture (less than 2 mm): Clay loam or clay
Clay content: 35 to 55 percent
Content of rock fragments: 35 to 80 percent—0 to
5 percent boulders; 10 to 30 percent stones
and cobbles; 25 to 45 percent gravel
Reaction: pH 6.6 to 7.3
Sagedale Series
Depth class: Very deep (60 inches or more)
Drainage class: Well drained
Permeability: Moderate (0.6 to 2.0 inches/hour)
Landform: Fan, hill, stream terrace, terrace, fan on
escarpment, swale on escarpment, and swale on
plain
Parent material: Clayey alluvium weathered from
shale and siltstone
Slope range: 0 to 35 percent
Elevation range: 3,900 to 6,000 feet
Mean annual precipitation: 15 to 19 inches
Mean annual air temperature: 43 to 45 degrees F
Frost-free period: 85 to 115 days
Taxonomic Class: Fine, smectitic, frigid Typic
Haplustepts
Typical Pedon
Sagedale clay loam, in an area of Sagedale clay
loam, 8 to 15 percent slopes, in an area of hayland,
2,000 south and 2,430 west of the northeast corner
of sec. 29, T. 4 N., R. 14 E.; USGS Battleship Butte
topographic quadrangle (lat. 46 o 04'11" N.; long.
110 o 00'23" W.)
Ap—0 to 4 inches; grayish brown (2.5Y 5/2) clay
loam, dark grayish brown (2.5Y 4/2) moist;
moderate thick platy structure; slightly hard, firm,
moderately sticky, moderately plastic; common
very fine and fine roots; common very fine and
fine pores; slightly effervescent; moderately
alkaline (pH 8.4); clear smooth boundary.
Bw1—4 to 8 inches; grayish brown (2.5Y 5/2) clay
loam, dark grayish brown (2.5Y 4/2) moist; weak
medium prismatic structure parting to moderate
coarse angular blocky; slightly hard, friable,
moderately sticky, moderately plastic; few
medium and common very fine and fine roots;
common very fine and fine pores; slightly
effervescent; moderately alkaline (pH 8.4); clear
smooth boundary.
Bw2—8 to 15 inches; grayish brown (2.5Y 5/2) clay
loam, dark grayish brown (2.5Y 4/2) moist;
moderate medium prismatic structure; slightly
hard, friable, moderately sticky, moderately
plastic; few medium and common very fine and
fine roots; common very fine and fine pores;
strongly effervescent; moderately alkaline
(pH 8.4); clear wavy boundary.
Bk1—15 to 36 inches; light brownish gray (2.5Y 6/2)
clay loam, grayish brown (2.5Y 5/2) moist;
moderate coarse subangular blocky structure;
moderately hard, firm, very sticky, moderately
plastic; common very fine and fine roots; common
very fine and fine pores; few fine and medium soft
masses and fine threads of lime; 5 percent gravel;
strongly effervescent; strongly alkaline (pH 8.4);
gradual smooth boundary.
Bk2—36 to 60 inches; light brownish gray (2.5Y 6/2)
clay loam, grayish brown (2.5Y 5/2) moist; weak
coarse subangular blocky structure; moderately
hard, firm, very sticky, moderately plastic; few
very fine and fine roots; common fine soft masses
and threads of lime; 5 percent gravel; strongly
effervescent; strongly alkaline (pH 8.4).
Range in Characteristics
Soil temperature: 42 to 47 degrees F
Moisture control section: Between 4 and 12 inches
Depth to the Bk horizon: 10 to 18 inches
A horizon
Hue: 10YR or 2.5Y
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2 or 3
Texture (less than 2 mm): Clay loam
Clay content: 30 to 40 percent
Content of rock fragments: 0 to 5 percent gravel
Reaction: pH 7.4 to 8.4
Bw horizons
Hue: 10YR or 2.5Y
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2 to 4
Texture (less than 2 mm): Clay loam, silty clay
loam, or silty clay
Clay content: 35 to 45 percent
Content of rock fragments: 0 to 5 percent gravel
Reaction: pH 7.4 to 8.4
Bk horizons
Hue: 10YR or 2.5Y
Value: 5 to 7 dry; 4 to 6 moist
Chroma: 2 to 4
Texture (less than 2 mm): Clay loam, silty clay
loam, or silty clay
Clay content: 35 to 45 percent