LOCATION SYCAN                   OR

Established Series
Rev. JSC/AON/RWL/CEG
02/2025

SYCAN SERIES

Landscape--Intermontane Basin
Landform--stream terraces on valley floors and on floors of gorges
Slope--0 to 2 percent
Parent material--sandy alluvium derived from coarse pumiceous volcanic ash and pumiceous tephra
Mean annual precipitation--about 410 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--moderately well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Ashy, glassy, nonacid, frigid Vitrandic Xeropsamments

TYPICAL PEDON: Sycan ashy loamy sand, rangeland.

A1--0 to 13 cm; ashy loamy sand, light brownish gray (10YR 6/2) dry, very dark grayish brown (10YR 3/2) moist; weak medium platy structure parting to weak fine granular; soft, very friable; many very fine roots; many very fine pores; neutral (pH 6.8); clear smooth boundary.

A2--13 to 43 cm; ashy loamy coarse sand, light brownish gray (10YR 6/2) dry, very dark grayish brown (10YR 3/2) moist; massive; soft, very friable; many very fine roots; many very fine pores; neutral (pH 7.3); gradual smooth boundary.

C1--43 to 76 cm; ashy loamy coarse sand, light gray (10YR 7/2) dry, dark brown (10YR 3/3) moist; massive; soft, very friable; few very fine roots; many very fine pores; slightly alkaline (pH 7.4); clear wavy boundary.

C2--76 to 127 cm; ashy coarse sand, very pale brown (10YR 8/3) dry, brown (10YR 4/3) moist; massive; soft, very friable; few very fine roots; many very fine pores; slightly alkaline (pH 7.4); gradual wavy boundary.

C3--127 to 200 cm; ashy coarse sand, light gray (10YR 7/2) dry, brown (10YR 5/3) and pale brown (10YR 6/3) moist; common dark reddish brown (5YR 3/4) redox concentrations; massive; soft, very friable; many very fine pores; slightly alkaline (pH 7.5)

TYPE LOCATION: Klamath County, Oregon; about 1/2 mile south of the confluence of Snake Creek and Sycan River; about 185 m north and 280 m east if the southwest corner of section 34, T. 35 S., R. 12 E.; latitude 42.48708 degrees north, longitude 121.2874 west, datum WGS 84 (coordinates estimated from PLSS details).

RANGE IN CHARACTERISTICS:

Soil Temperature: frigid regime
Mean annual soil temperature-- 6 to 8 degrees C
Mean summer soil temperature-- 11 to 13 degrees C
Moisture control section--30 to 90 cm; xeric regime; dry in all parts for 60 to 90 consecutive days in July through October
Rock fragments--fine (2 to 4 mm) pumice paragravel
Depth to redox concentrations--greater than 100 cm

Particle-size control section
*Clay content--0 to 5 percent (weighted average)
*Pumice rock fragment content--0 to 14 percent

Estimated andic properties, all mineral horizons:
*Ammonium oxalate extractable Al plus 1/2 Fe--0.05 to 0.2 percent
*Medium to very coarse sand in the .02 to 2.0 mm fraction--greater than 50 percent
*P-retention--3 to 20 percent
*Volcanic glass content--30 to 70 percent glass and glass-coated aggregates
*1/3-bar bulk density--0.70 to 1.00 g/cm3
*1500 kPa water (air-dried samples)--less than 25 percent

A horizons
Value--2 or 3 moist, 4 to 6 dry
Fine-earth texture--ashy loamy coarse sand, ashy loamy sand
Paragravel content--0 to 14 percent fine (2 to 4 mm) pumice paragravel
Reaction--neutral or slightly alkaline (pH 6.6 to 7.8)
Thickness--17 to 55 cm

C horizons
Value--3 to 6 moist, 6 to 8 dry
Chroma--3 or 4 moist, 2 or 3 dry
Fine-earth texture--ashy coarse sand, ashy loamy coarse sand, ashy loamy sand
Paragravel content--0 to 14 percent
Reaction--neutral or slightly alkaline (pH 6.6 to 7.8)

COMPETING SERIES:
No competing series

GEOGRAPHIC SETTING:
Elevation--1300 to 1350 m
Climate--cold, wet winters and cool, dry summers
Mean annual air temperature--4 to 7 degrees C
Mean annual precipitation--310 to 540 mm
Frost-free period--50 to 70 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Klamath--on flood plains; seasonal high water table and redoximorphic features at the soil surface (poorly drained); silt loam or silty clay loam textures
Ontko--on flood plains; seasonal high water table and redoximorphic features at the soil surface (poorly drained); clay loam, ashy sandy clay loam and sandy loam textures
Godowa--on flood plain steps and terraces; upper depth of seasonal high water table and redoximorphic features is 50 cm (somewhat poorly drained)
Yonna--on flood plain steps; seasonal high water table is at a depth of 0 to 100 cm from February to June, with redoximorphic features occurring below 50 cm (somewhat poorly drained); interbedded loamy and sandy textures

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained
Saturation in normal years--endosaturation below a depth of 100 cm in February through May, below a depth of 150 cm in July through December
Flooding--occasional, brief flooding, March through May
Ponding--none
Saturated hydraulic conductivity (Ksat)--high to very high throughout

USE AND VEGETATION:
Use--irrigated pasture, alfalfa hay, cereal hay, livestock grazing, and wildlife
Vegetation--big sagebrush, silver sagebrush, green rabbitbrush, gray rabbitbrush

DISTRIBUTION AND EXTENT: Cascade Mountains, Eastern Slope, Oregon; MLRA 6; small extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Klamath County, Oregon, 1977.

REMARKS:
Diagnostic horizons and features in this pedon
*Ochric epipedon
*Volcanic glass--throughout (zone from 0 to 200 cm)
*Redoximorphic concentrations--zone from 127 to 200 cm
*Particle-size control section--zone from 25 to 100 cm
*Pumice and ash are originally from Mt. Mazama, deposited during a subsequent outburst flood

NASIS Site and Pedon ID 1977OR035013

ADDITIONAL DATA:
Kellogg Soil Survey Laboratory (KSSL) characterization--19N0329 (NASIS Site and pedon ID S2018OR035002)

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National Cooperative Soil Survey
U.S.A.