LOCATION MACKATIE                OR

Established Series
Rev: GDM/RWL
01/2023

MACKATIE SERIES

The Mackatie series consists of deep, well drained soils on mountains. They formed in residuum and colluvium derived dominantly from andesite with a mantle of volcanic ash in the surface. Slopes are 0 to 30 percent. The mean annual precipitation is about 65 inches and the mean annual temperature is about 40 degrees F.

TAXONOMIC CLASS: Ashy over loamy, amorphic over isotic, frigid Alfic Udivitrands

TYPICAL PEDON: Mackatie sandy loam - on a nearly level slope, woodland. (Colors are for moist soil unless otherwise noted.)

Oi -- 3 inches to 0; organic layer of needles and twigs.

A -- 0 to 6 inches; dark brown (7.5YR 3/2) sandy loam, brown (7.5YR 4/3) dry; weak medium subangular blocky structure parting to weak fine granular; soft, very friable, nonsticky and nonplastic; many very fine, fine and few medium and coarse roots; many very fine, fine and few medium and coarse irregular pores; 5 percent gravel and 5 percent cobbles; strongly acid (pH 5.4); clear smooth boundary. (4 to 8 inches thick)

AB -- 6 to 18 inches; dark brown (7.5YR 3/4) sandy loam, brown (7.5YR 5/4) dry; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; many very fine, fine and few medium and coarse roots; many very fine, fine and few medium and coarse tubular pores; 5 percent gravel and 5 percent cobbles; strongly acid (pH 5.3); clear smooth boundary. (8 to 12 inches thick)

2Bt1 -- 18 to 28 inches; dark brown (10YR 4/3) loam, yellowish brown (10YR 5/4) dry; moderate medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; many very fine, fine and few medium and coarse roots; many very fine, fine and few medium tubular pores; few faint clay films on faces of peds and lining pores; 10 percent gravel; strongly acid (pH 5.4); clear smooth boundary.

2Bt2 -- 28 to 41 inches; brown (10YR 4/3) clay loam, light yellowish brown (10YR 6/4) dry, moderate coarse subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common very fine, fine and few medium roots; common very fine, fine and few medium tubular pores; common distinct clay films on faces of peds and lining pores; 10 percent gravel; moderately acid (pH 5.9); abrupt smooth boundary. (combined thickness of the 2Bt horizon is 22 to 30 inches)

3C -- 41 to 51 inches; brown (10YR 4/3) extremely cobbly clay loam, light yellowish brown (10YR 6/4) dry; massive; hard, firm, slightly sticky and slightly plastic; 50 percent cobbles and 20 percent gravel; strongly acid (pH 5.2); clear wavy boundary. (0 to 12 inches thick)

3Cr -- 51 inches; weathered andesite bedrock.

TYPE LOCATION: Wasco County, Oregon: 3000 feet west and 2000 feet north of the SE corner of section 20, T.5 S., R.10 E. (Latitude 45 degrees, 07 minutes, 13 seconds N; Longitude 121 degrees, 34 minutes, 11 seconds E) Warm Springs Indian Reservation.

RANGE OF CHARACTERISTICS: These soils are usually moist and are not dry in all parts of the moisture control section for as long as 45 consecutive days in the four months that follow the summer solstice. The mean annual soil temperature is 40 to 44 degrees F. Depth to weathered andesite bedrock is 40 to 60 inches. Hue is 10YR or 7.5YR. Thickness of the ashy material is 14 to 20 inches. The particle-size control section has 10 to 15 percent clay in the upper part and 25 to 35 percent clay in the lower contrasting part. Soil reaction is moderately to strongly acid.

The A horizon has value of 2 or 3 moist, 4 or 5 dry and chroma of 2 or 3 moist and dry. The moist bulk density is 0.80 to 0.90g/cc. It has a phosphate retention of 70 to 90 percent and acid oxalate aluminum plus 1/2 iron of 2 to 3 percent in the less than 2.0 mm fraction. There is 30 to 50 percent volcanic glass and glass aggregate in the 0.02 to 2.0 mm fraction. The 15-bar water retention is 8 to 12 percent on air dried samples. It has 0 to 10 percent gravel and 0 to 10 percent cobbles.

The AB horizon is similar to the A and has value of 3 or 4 moist, 4 or 5 dry and chroma of 3 or 4 moist and dry. It has 0 to 10 percent gravel and 0 to 10 percent cobbles

The 2Bt horizon has value of 4 or 5 moist, 5 or 6 dry and chroma of 3 or 4 moist and dry. It is loam or clay loam and has 10 to 20 percent gravel and 0 to 10 percent cobbles. It has a phosphate retention of 50 to 75 percent and acid oxalate aluminum plus 1/2 iron of 0.4 to 1 percent. There is 5 to 15 percent volcanic glass and glass aggregate. The 15-bar water retention is 16 to 30 percent on air dried samples.

The 3C horizon, when present, has color similar to the 2Bt2 horizon. It has 10 to 20 percent gravel and 45 to 60 percent cobbles.

COMPETING SERIES: These are the Hobnail (T) and Odonnel (T) series. Hobnail soils are more than 60 inches to bedrock and have E horizons. Odonnel soils have glossic horizons.

GEOGRAPHIC SETTING: Mackatie soils are on nearly level to moderately steep concave side slopes of mountains. Elevation ranges from 3000 to 5600 feet. Slopes are 0 to 30 percent. The soil formed in residuum and colluvium derived dominantly from andesite with a mantle of volcanic ash in the surface. The climate is characterized by cool and wet winters and warm and moist summers. The mean annual precipitation is 40 to 90 inches. The mean annual temperature is 38 to 42 degrees F. The frost-free period is 30 to 90 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Howash and Kutcher soils. Howash soils are ashy-skeletal, somewhat excessively drained, very deep to bedrock and are on adjacent side slopes. Kutcher soils are ashy-skeletal, are moderately deep to bedrock, and are on south-facing side slopes.

DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately slow.

USE AND VEGETATION: These soils are used for timber production, watershed and wildlife habitat. The native vegetation is western hemlock, western larch, Douglas fir, grand fir, and Ponderosa pine with an understory of common snowberry, pachystima, queencup beadlily, princes pine, vine maple, strawberry and pinegrass.

DISTRIBUTION AND EXTENT: North-central Oregon; MLRA 3. The soils of this series are of moderate extent.

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

SERIES ESTABLISHED: Wasco County (Warm Springs Indian Reservation), Oregon, 1993.

REMARKS: Diagnostic horizons and features in this pedon include:

Ochric epipedon

Argillic horizon - from 18 to 41 inches (2Bt1, 2Bt2 horizons).

Andic properties - from the surface to 18 inches (A and AB horizons).

Particle-size control section - from the surface to 40 inches (A, AB, 2Bt1 and 2Bt2 horizons).

Contrasting ashy over loamy family - andic soil properties and 15-bar water (air-dried) of less than 12 percent from the surface to 18 inches (A and AB horizons) over, a zone with no andic soil properties and less than 30 percent volcanic glass and glass aggregate from 18 to 41 inches (2Bt2 and 2Bt2 horizons).

ADDITIONAL DATA: Mackatie reference sample S90OR-031-006, pedon # 90P359; sampled by NSSL, Lincoln, Nebraska 6/90.

---

National Cooperative Soil Survey
U.S.A.