LOCATION LOGSPRINGS OREstablished Series
TAXONOMIC CLASS: Fine-loamy over clayey, mixed over smectitic, superactive, mesic Vitrandic Haploxeralfs
TYPICAL PEDON: Logsprings loam - on a nearly level slope, woodland. (Colors are for moist soil unless otherwise noted.)
A--0 to 10 inches; dark grayish brown (10YR 4/2) loam, light brownish gray (10YR 6/2) dry; moderate medium platy structure; slightly hard, friable, nonsticky and nonplastic; many very fine, fine and common medium and coarse roots; many very fine, fine and common medium and coarse irregular pores; few fine faint organic stains on faces of peds and lining pores; 5 percent gravel; neutral (pH 7.0); gradual smooth boundary. (7 to 14 inches thick)
Bt1--10 to 21 inches; brown (7.5YR 4/2) loam, pinkish gray (7.5YR 6/2) dry; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine and common medium and coarse roots; many very fine, fine and common medium and coarse tubular pores; common distinct clay films on faces of peds and lining pores; few fine faint organic stains on faces of peds and lining pores; 10 percent gravel; slightly acid (pH 6.4); abrupt smooth boundary. (11 to 16 inches thick)
2Bt2--21 to 30 inches; dark brown (7.5YR 3/3) clay, light brown (7.5YR 6/3) dry; strong coarse prismatic structure; very hard, very firm, very sticky and very plastic; common very fine, fine, and medium roots; common very fine, fine, and medium tubular pores; continuous prominent clay films on faces of peds and lining pores; common very fine and fine manganese stains; many distinct organic stains on faces of peds and lining pores; slightly acid (pH 6.2); clear smooth boundary. (8 to 12 inches thick)
3Bt3--30 to 36 inches; dark brown (7.5YR 4/3) extremely gravelly sandy clay loam, light brown (7.5YR 6/3) dry; moderate medium subangular blocky structure; very hard, very firm, slightly sticky and slightly plastic; common very fine, fine, and few medium roots; common very fine, fine, and few medium tubular pores; many distinct clay films on faces of peds and lining pores; many distinct organic stains on faces of peds and lining pores; 65 percent gravel; slightly acid (pH 6.2); clear smooth boundary. (5 to 8 inches thick)
4BCt--36 to 64 inches; dark brown (7.5YR 4/2) loam, pinkish gray (7.5YR 6/2) dry; moderate medium and fine subangular blocky structure; hard, firm, nonsticky and nonplastic; common fine and coarse roots along faces of peds; common very fine and fine tubular pores; many faint clay films on faces of peds; many organic stains on faces of peds; 5 percent gravel; slightly acid (pH 6.2)
TYPE LOCATION: Wasco County, Oregon, 2500 feet west and 2000 feet north of the SE corner of section 16, T.6 S., R.11 E. (Latitude 45 degrees, 02 minutes, 50 seconds N, Longitude 121 degrees, 25 minutes, 52 seconds W) Warm Springs Indian Reservation.
RANGE OF CHARACTERISTICS: These soils are usually moist, but are dry in all parts of the moisture control section for 60 to 90 consecutive days within the four months that follow the summer solstice. The mean annual soil temperature is 47 to 51 degrees F. Depth to sedimentary bedrock is greater than 60 inches. Depth to the 2Bt is 20 to 30 inches. The particle-size control section is 20 to 27 percent clay in the upper part and 40 to 50 percent clay in the lower part. Hue is 7.5YR or 10YR.
The A horizon has value of 3 or 4 moist, 5 or 6 dry and chroma of 1 or 2 moist and dry. It contains 0 to 5 percent gravel. It is estimated to have 10 to 30 percent volcanic glass and 0.4 to 1.0 percent acid oxalate extractable aluminum plus one-half iron.
The Bt horizon has value of 3 or 4 moist, 6 or 7 dry, and chroma of 2 or 3 moist and dry. It has 20 to 25 percent clay and contains 0 to 10 percent gravel. It is estimated to have 10 to 30 percent volcanic glass and 0.15 to 0.35 percent acid oxalate extractable aluminum plus one-half iron.
The 2Bt2 horizon has value of 3 or 4 moist, 6 or 7 dry, and chroma of 3 or 4 moist and dry. It is clay or silty clay with 40 to 50 percent clay.
The 3Bt3 horizon has value of 4 or 5 moist, 6 or 7 dry, and chroma of 3 or 4 moist and dry. It is sandy clay loam or clay loam with 30 to 40 percent clay. It contains 60 to 70 percent gravel.
The 4BCt horizon has value of 4 or 5 moist, 6 or 7 dry, and chroma of 2 or 3 moist and dry. It is loam or silt loam with 10 to 20 percent clay. It contains 0 to 10 percent gravel.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Logsprings soils are on nearly level to moderately sloping concave areas on benches. The soil formed in alluvium and colluvium over residuum derived dominantly from sedimentary rock with an influence of volcanic ash. Slopes are 0 to 8 percent. Elevation ranges from 2600 to 2800 feet. The climate is characterized by cool and wet winters and hot and dry summers. The mean annual precipitation is 16 to 20 inches. The mean annual temperature is 45 to 49 degrees F. The frost-free period is 90 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bodell and Dahl soils. Bodell soils are loamy-skeletal, well drained, shallow to bedrock, and on adjacent south-facing side slopes of mountains. Dahl soils are fine, montmorillonitic mineralogy and are on adjacent basins.
DRAINAGE AND PERMEABILITY: Moderately well drained. Permeability is slow. A perched water table is at a depth of 1.5 to 2.5 feet from March to May.
USE AND VEGETATION: These soils are used for timber production, livestock grazing and wildlife habitat. The native vegetation is Ponderosa pine with an understory of antelope bitterbrush, mules ear, and prairiesmoke avens.
DISTRIBUTION AND EXTENT: North-central Oregon; MLRA 6. The soils of this series are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wasco County (Warm Springs Indian Reservation), Oregon, 1993.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the surface to a depth of 10 inches (A horizon).
Argillic horizon - The zone from 10 to 36 inches (Bt1, 2Bt2, and 3Bt3 horizons).
Vitrandic feature - The zone from the surface to 10 inches (A horizon).
Particle-size control section - The zone from 10 to 30 inches (Bt1 and 2Bt2 horizons) with 10 to 21 inches qualifying for fine-loamy family and 21 to 30 inches qualifying for clayey family.