LOCATION WANOGA OR

Established Series
Rev. WMF/TDT
06/2011

WANOGA SERIES

The Wanoga series consists of moderately deep, well drained soils on volcanic uplands. They formed in volcanic ash over bedrock. Slopes are 0 to 65 percent. The mean annual precipitation is about 15 inches and the mean annual temperature is about 45 degrees F.

TAXONOMIC CLASS: Ashy, glassy, frigid Humic Vitrixerands

TYPICAL PEDON: Wanoga ashy sandy loam - woodland, on a 10 percent northwest-facing slope at 2900 feet elevation. (When described (7/22/86), the soil was dry throughout. Colors are for moist soil unless otherwise noted.)

Oi--0 to 1 inch; slightly decomposed needles and twigs of ponderosa pine.

A1--1 to 3 inches; very dark brown (10YR 2/2) ashy sandy loam, dark grayish brown (10YR 4/2) dry; weak fine granular structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; many fine irregular pores; 5 percent gravel; neutral (pH 6.8); gradual wavy boundary.

A2--3 to 13 inches; dark brown (10YR 3/3) ashy sandy loam, brown (10YR 4/3) dry; weak fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine, fine and medium roots; many very fine irregular pores; 5 percent gravel; neutral (pH 6.8); gradual wavy boundary. (Combined thickness of the A horizon is 10 to 22 inches).

Bw--13 to 25 inches; dark brown (10YR 3/3) ashy sandy loam, brown (10YR 5/3) dry; weak fine and medium subangular blocky; slightly hard, friable, nonsticky and nonplastic; few very fine, fine, medium, and coarse roots; many very fine irregular and few fine tubular pores; 10 percent gravel; neutral (pH 7.0); clear wavy boundary. (9 to 25 inches thick).

2Crqt--25 to 35 inches; weathered tuff; silica coatings and clay coatings are present in the vesicles of the rock.

2R--35 inches; tuff.

TYPE LOCATION: Deschutes County, Oregon, 500 feet east and 500 feet south of the northwest corner of section 19, T. 14 S., R. 11 E. (Latitude 44 degrees, 21 minutes, 15 seconds N, Longitude 121 degrees, 28 minutes, 12 seconds W)

RANGE IN CHARACTERISTICS: These soils are usually moist and are dry in all parts of the soil moisture control section for 90 to 110 consecutive days after the summer solstice. The mean annual soil temperature is 44 to 47 degrees F. Depth to bedrock is 20 to 40 inches. The solum contains 50 to 80 percent volcanic glass and glass-coated aggregates. Phosphate retention is 40 to 70 percent. The acid oxalate extractable aluminum plus one-half the acid oxalate extractable iron is 0.40 to 1.0 percent. The 15-bar water content on dried and undried samples is 5 to 12 percent. Field estimated clay content is 5 to 15 percent. The mollic epipedon is 10 to 15 inches thick. Base saturation is 80 to 100 percent by ammonium acetate.

The A horizon has hue of 10YR, value of 2 or 3 moist, 4 or 5 dry and chroma of 2 or 3 moist and dry. It contains 0 to 30 percent gravel. It has a fine earth texture of ashy sandy loam, ashy loamy sand, ashy loamy coarse sand or ashy sand. It is neutral or slightly acid..

The Bw horizon has hue of 10YR, value of 2 through 4 moist, 5 or 6 dry and chroma of 2 or 3 moist and dry. It is ashy sandy loam, ashy fine sandy loam or cobbly ashy sandy loam. It contains 0 to 10 percent durinodes and 0 to 25 percent concretions that are very friable when moist. It contains 0 to 15 percent gravel and 0 to 30 percent cobbles. Total coarse fragments range from 0 to 30 percent.

The 2Crqt horizon, when present, contains silica and clay coatings. It may have a discontinuous silica cap at the upper boundary.

COMPETING SERIES: These are the Corbey, Ermabell, Laidlaw, Lundgren, Retep, Suttle, and Trailcreek series. All of these soils except Retep and Trailcreek are over 40 inches deep to bedrock. Retep soils are dry for 60 to 75 consecutive days and has 18 to 27 percent clay in the lower part of the particle-size control section. Trailcreek soils lack an O horizon and are neutral to moderately alkaline.

GEOGRAPHIC SETTING: Wanoga soils are on volcanic uplands and plateaus. Elevations are 2800 to 5900 feet. Slopes are 0 to 65 percent. They formed in volcanic ash over bedrock. The climate is characterized by cold, wet winters and hot, dry summers. The mean annual precipitation is 12 to 20 inches. The mean annual temperature is 42 to 47 degrees F. The frost-free period is 20 to 90 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fremkle, Fryrear, Henkle, and the competing Laidlaw soils. The Fremkle and Henkle soils are 10 to 20 inches to bedrock. Fryrear soils are ashy-skeletal.

DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability.

USE AND VEGETATION: These soils are used for livestock grazing, timber production, wildlife habitat, and recreation. Potential native vegetation is ponderosa pine, western juniper, antelope bitterbrush, mountain big sagebrush, and Idaho fescue.

DISTRIBUTION AND EXTENT: Footslopes and plateaus of the eastern Cascades of central Oregon; MLRA 6. The series is moderately extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Deschutes County (Upper Deschutes River Area), Oregon, 1992.

REMARKS: Diagnostic horizons and other features in this pedon are:

mollic epipedon: from 1 to 13 inches (A1, A2 horizons). Base saturation is 84 to 99 percent (NH40AC) for all horizons.

cambic horizon: from 13 to 25 inches (Bw horizon). This horizon has mollic colors but lacks the organic matter content to qualify as mollic.

andic soil properties: P-retention is 60 percent for all horizons. The amount of glass and glass-coated aggregate in the very fine sand fraction is 70 percent for all horizons. The acid oxalate extractable aluminum plus one-half the acid oxalate extractable iron is 0.45 percent in the A horizons and 0.35 in the Bw horizon.

Vitri (great group): The 15-bar water content on both dried and undried samples is 9.0 for all horizons.

The ash deposit is from Mt. Mazama.

ADDITIONAL DATA: Laboratory data from type location S860R-017-001.

National Cooperative Soil Survey
U.S.A.