LOCATION CROOKED CREEK UT+CO ID NVEstablished Series
TAXONOMIC CLASS: Fine, smectitic, frigid Cumulic Endoaquolls
TYPICAL PEDON: Crooked Creek clay loam--irrigated cropland. (Colors are for air-dry soil unless otherwise stated.)
A1--0 to 2 inches; dark grayish brown (10YR 4/2) clay loam, black (10YR 2/1) moist; weak thick platy structure parting to strong fine granular; hard, firm, slightly sticky and slightly plastic; many fine roots; mildly alkaline (pH 7.6); abrupt smooth boundary. (1 to 4 inches thick)
A2--2 to 12 inches; dark gray (10YR 4/1) clay loam, black (10YR 2/1) moist; strong medium and coarse granular structure; very hard, firm, sticky and slightly plastic; many fine and medium roots; few fine pores; moderately alkaline (pH 7.9); clear smooth boundary. (3 to 10 inches thick)
A3--12 to 23 inches; dark gray (10YR 4/1) clay loam, black (10YR 2/1) moist; few medium faint redoximorphic concentrations; weak medium prismatic structure parting to strong fine and medium blocky; extremely hard, very firm, sticky and plastic; many fine and medium roots; few fine pores; mildly alkaline (pH 7.4); clear smooth boundary. (4 to 15 inches thick)
A4--23 to 33 inches; dark gray (10YR 4/1) silty clay, black (10YR 2/1) moist; few medium faint redoximorphic concentrations; moderate medium prismatic structure parting to strong and medium angular blocky; extremely hard, extremely firm, very sticky and very plastic; common fine and medium roots; few fine pores; neutral (pH 7.0); diffuse smooth boundary. (3 to 14 inches thick)
C1--33 to 42 inches; grayish brown (2.5Y 5/2) clay loam, very dark grayish brown (2.5Y 3/2) moist; many fine distinct yellowish brown (10YR 5/6) redoximorphic concentrations; moderate very coarse subangular blocky structure parting to strong fine and medium subangular blocky; very hard, firm, sticky and plastic; common fine and medium roots; few fine pores; neutral (pH 7.1); diffuse smooth boundary. (8 to 13 inches thick)
C2--42 to 50 inches; light olive brown (2.5Y 3/3) clay loam, very dark grayish brown (2.5Y 3/2) moist; many large prominent dark greenish gray (5G 4/1) redoximorphic depletions; weak medium subangular blocky structure; hard, firm, slightly sticky and plastic; few fine and medium roots; few fine pores; neutral (pH 7.0); diffuse smooth boundary. (0 to 14 inches thick)
C3--50 to 70 inches; grayish brown (2.5Y 5/2) clay loam, very dark grayish brown (2.5Y 3/2) moist; common medium prominent dark greenish gray (5G 4/1) redoximorphic depletions; weak medium subangular blocky structure; hard, firm, sticky and plastic; few fine and medium roots; few fine pores; neutral (pH 7.0).
TYPE LOCATION: Wasatch County, Utah; approximately 400 feet northeast of Heber sewage plant; about 2,630 feet south and 2,300 feet west of the northeast corner of sec. 31, T. 3 S., R. 5 E.
RANGE IN CHARACTERISTICS: Seasonal high water table is from 0 to 18 inches. Soil temperature is 43 to 47 degrees F.
The mollic epipedon thickness is greater than 24 inches. The control section averages 35 to 50 percent clay. Texture is clay loam, silty clay loam, clay or silty clay with thin lenses of loam or silt loam. Rock fragments average 0 to 10 percent. Profile reaction is neutral to moderately alkaline.
The A horizon value is 3 to 5 dry, 1 to 3 moist. Chroma is 1 or 2. Structure is granular, subangular blocky or prismatic parting to angular blocky. Subhorizons have faint to distinct redoximorphic concentrations.
C horizons - Hue is 10YR, 7.5YR, 5Y or 2.5Y. Value is 3 to 6 dry, 3 to 5 moist. Chroma is 1 to 4. Texture is clay loam, silty clay loam, silt loam, clay or silty clay. Weighted average clay content is 35 to 45 percent. Rock fragments average 0 to 10 percent. Some pedons may have up to 75 percent rock fragments in the subhorizon below 36 inches, but these are not consistent or continuous. Some pedons have continuous stratified extremely gravelly sandy to very gravelly sandy loam substratums below a depth of 40 inches. Structure is subangular blocky or it is massive. These horizons have distinct or prominent redoximorphic depletions and concentrations with hues of 7.5YR to 5G.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Crooked Creek soils are on axial stream flood-plains, inset fans, valley floors, stream terraces, and localized seeps on alluvial fans. These soils formed in alluvium from mixed sedimentary and igneous rocks. Slopes are 0 to 4 percent. Elevations are 4,800 to 6,800 feet. The climate is moist subhumid. The mean annual precipitation is 8 to 22 inches; mean annual temperature is 43 to 46 degrees F., and the freeze-free period is 50 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Canburn, Eastcan, Kovich and Manila soils. Canburn and Kovich soils have fine loamy control sections. Eastcan soils lack mottles within a depth of 20 inches. Manila soils lack mottles and have argillic horizons.
DRAINAGE AND PERMEABILITY: Poorly drained, slow runoff; slow or very slow permeability. Drained phases are also recognized.
USE AND VEGETATION: Irrigated hay land, rangeland and wildlife habitat. The present vegetation is mainly willows, sedges, baltic rush, native bluegrass, tufted hairgrass, clover, cinquefoil, yarrow, aster and daisy.
DISTRIBUTION AND EXTENT: Northeast Nevada and northern Utah. These soils are not extensive. MLRA D25, D28A, E47, and E48A.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Wasatch County, Utah-Wasatch survey area, 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the surface to 33 inches (A1, A2, A3, and A4 horizons).
Particle-size control section - The zone from 10 to 40 inches (A3, A4, and part of the A2 and C1 horizons).
The classification is based on the "Keys to Soil Taxonomy, Eighth Edition, 1998". Field study is needed to determine if "Cumulic" or "Cumulic Vertic" is the correct subgroup. The wide precipitation range of 8 to 22 inches and various phases with a wide range of water table depths indicates that this series needs to be refined in an MLRA update.