LOCATION CROOKED CREEK           UT+CO ID NV

Established Series
Rev. MWS/RLT/MJD/JBF
07/2011

CROOKED CREEK SERIES

The Crooked Creek series consists of very deep, poorly drained soils that formed in alluvium derived from mixed sedimentary and igneous rocks. Crooked Creek soils are on axial stream flood-plains, stream terraces, inset fans, valley floors and localized seeps on alluvial fans. Slope ranges from 0 to 4 percent. The mean annual precipitation is about 360 mm and the mean annual temperature is about 7 degrees C.

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 5 cm; 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; slightly alkaline (pH 7.6); abrupt smooth boundary. (2 to 10 cm thick)

A2--5 to 30 cm; dark gray (10YR 4/1) clay loam, black (10YR 2/1) moist; strong medium and coarse granular structure; very hard, firm, moderately sticky and slightly plastic; many fine and medium roots; few fine pores; moderately alkaline (pH 7.9); clear smooth boundary. (8 to 25 cm thick)

A3--30 to 58 cm; 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, moderately sticky and moderately plastic; many fine and medium roots; few fine pores; slightly alkaline (pH 7.4); clear smooth boundary. (10 to 38 cm thick)

A4--58 to 84 cm; 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. (8 to 36 cm thick)

C1--84 to 107 cm; 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, moderately sticky and moderately plastic; common fine and medium roots; few fine pores; neutral (pH 7.1); diffuse smooth boundary. (20 to 33 cm thick)

C2--107 to 127 cm; dark 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 moderately plastic; few fine and medium roots; few fine pores; neutral (pH 7.0); diffuse smooth boundary. (0 to 36 cm thick)

C3--127 to 178 cm; 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.; USGS Francis 7.5 minute topographic quadrangle; latitude 40 degrees 30 minutes 52 seconds N longitude 111 degrees 25 minutes 22 seconds W; NAD 83.

RANGE IN CHARACTERISTICS:
Seasonal high water table: 0 to 46 cm.
Mean annual soil temperature: 6 to 8 degrees C.
Mollic epipedon thickness: Greater than 60 cm.
Reaction: Neutral through moderately alkaline.

Particle-size control section - Clay content: 35 to 50 percent clay.

A horizon
Value: 3 to 5 dry, 1 to 3 moist.
Chroma: 1 or 2.
Structure: Granular, subangular blocky or prismatic parting to angular blocky. Subhorizons have faint to distinct redoximorphic concentrations.

C horizons
Hue: 10YR, 7.5YR, 5Y or 2.5Y.
Value: 3 to 6 dry, 3 to 5 moist.
Chroma: 1 to 4.
Texture: Clay loam, silty clay loam, silt loam, clay or silty clay with thin lenses of loam or silt loam.
Clay content: Averages 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 90 cm, 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 100 cm.
Structure: Subangular blocky or it is massive.
Other features: 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 derived from mixed sedimentary and igneous rocks. Slopes are 0 to 4 percent. Elevations are 1,485 to 2,075 meters. The climate is moist subhumid. The mean annual precipitation is 200 to 560 mm; mean annual temperature is 6 to 8 degrees C, 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 50 cm. Manila soils lack mottles and have argillic horizons.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained, slow runoff; moderately low saturated hydraulic conductivity. 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 SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona

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 84 cm (A1, A2, A3, and A4 horizons).
Endosaturation features - The zone from 30 to 178 cm (A3, C1, C2 and C3 horizons).
Particle-size control section - The zone from 25 to 100 cm (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 200 to 560 mm and various phases with a wide range of water table depths indicates that this series needs to be refined in an MLRA update.

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National Cooperative Soil Survey
U.S.A.