LOCATION HOODVIEW OR
Established Series
Rev. AON/RWL
06/2011
HOODVIEW SERIES
The Hoodview series consists of very deep, well drained soils that formed in medium textured glacial till derived mostly from rocks of the Cascade Andesite Formation. Hoodview soils are on fans and mountain sideslopes in glaciated valleys in the Cascade Mountains. Slopes are 5 to 90 percent. The mean annual precipitation is about 95 inches and mean annual temperature is about 51 degrees F.
TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Andic Humudepts
TYPICAL PEDON: Hoodview very gravelly loam, forested. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed litter of needles, twigs, cones, leaves, etc.
A1--1 to 7 inches; black (10YR 2/1) very gravelly loam, dark grayish brown (10YR 4/2) dry; strong fine and medium granular and very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; 50 percent gravel and cobbles; many roots; many very fine and fine irregular pores; moderately acid (pH 5.7); clear wavy boundary. (3 to 9 inches thick)
A2--7 to 12 inches; very dark brown (10YR 2/2) extremely gravelly loam, dark brown (10YR 4/3) dry; strong fine and medium granular and very fine subangular blocky structure; slightly hard, slightly sticky and slightly plastic; weakly smeary; 60 percent gravel, cobbles, and stones; many roots; many very fine and fine irregular pores; moderately acid (pH 5.9); gradual wavy boundary. (6 to 20 inches thick)
Bw--12 to 23 inches; dark brown (10YR 3/3) extremely gravelly loam, brown (10YR 5/3) dry; moderate fine and very fine subangular blocky and granular structure; slightly hard, friable, slightly sticky and slightly plastic; 70 percent gravel, cobbles, and stones; many roots; many very fine and fine irregular pores; moderately acid (pH 5.9); gradual wavy boundary. (6 to 20 inches thick)
C--23 to 61 inches; dark brown (10YR 3/3) extremely cobbly loam, brown (10YR 5/3) dry; massive; slightly hard, very friable, slightly sticky and slightly plastic; 70 percent gravel, cobbles, and stones; common roots; many very fine and fine irregular and tubular pores; moderately acid (pH 6.0).
TYPE LOCATION: Clackamas County, Oregon; along the Salmon River Road; SW1/4 SW1/4 section 15, T.3S., R.7E., W.M.
RANGE IN CHARACTERISTICS: The profiles are usually moist but are dry for a short period of less than 45 consecutive days between depths of 8 to 24 inches during the summer. The mean annual soil temperature ranges from 47 to 54 degrees F. Depth to bedrock dominantly is 60 inches or more. Thickness of solum ranges epipedon is 20 to 30 inches thick. Hue is 10YR but range to 7.5YR in some pedons. The umbric epipedon is 20 to 30 inches thick.
The A horizon has value of 2 moist, 4 or 5 dry and chroma of 1 or 2 moist and dry. It is estimated to have acid oxalate extractable aluminum plus one-half iron of 1.0 to 2.0 percent and less than 2.0 cmol per kg fine earth of 1N KCL extractable aluminum. It has 15 to 22 percent clay by field estimate.
The B horizon has value of 3 moist, 5 or 6 dry, and chroma of 2 or 3 moist and dry. It is extremely gravelly loam or very cobbly loam with 15 to 22 percent clay.
The C horizon has value of 3 or 4 moist and 5 or 6 dry. It is extremely gravelly loam, very cobbly loam, or extremely gravelly sandy loam with 10 to 22 percent clay.
COMPETING SERIES: This is the
Aschoff series. Aschoff soils have umbric epipedons 10 to 12 inches thick.
GEOGRAPHIC SETTING: The Hoodview soils are on fans and mountain side slopes in glaciated valleys in the Cascade Mountains at elevations of 200 to 3,000 feet. Slopes range from 5 to 90 percent. The soils formed in medium textured glacial till weathered mostly from rocks of the Cascade Andesite formation (olivine basalts and olivine-bearing andesites), although material weathered from the Rhododendron formation (tuffs, breccias, and agglomerates) and Columbia River Basalt formation are also present in some areas. The climate is characterized by warm wet winters and hot moist summers. The mean annual precipitation is 80 to 115 inches, falling as rain in the autumn, winter, and spring. Rainfall amounts are relatively low in the summer. The mean January temperature is 35 degrees F.; the mean July temperature is 63 degrees F. The mean annual temperature is 45 to 52 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Brightwood, and Bull Run soils and the competing
Aschoff soils. Brightwood soils lack any evidence of amorphous properties. Bull Run soils are medial, lack rock fragments in the 10 to 40 inch control section and are dominated by amorphous clays and pyroclastic materials.
DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability.
USE AND VEGETATION: The Hoodview soils are used for producing timber, recreation and wildlife habitat. The overstory vegetation is Douglas-fir, western hemlock, western redcedar and red alder. Understory plants mainly are swordfern, oxalis and vine maple.
DISTRIBUTION AND EXTENT: Cascade Mountains of northwest Oregon; MLRA 3. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clackamas County, Oregon (Bull Run, Sandy Area), 1976.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Umbric epipedon - from 1 to 23 inches (A1, A2, and Bw horizons)
Andic feature - from 1 to 12 inches having a moist bulk density of 0.85 to 0.95 grams per cubic centimeter and an estimated acid oxalate extractable aluminum plus one-half iron of 1.0 to 2.0 percent.
Particle-size control section - from 11 to 41 inches (lower 1 inch of A2 horizon, Bw, and upper 18 inches of C horizon) having a weighted average of 70 percent rock fragments and less than 18 percent clay.
ADDITIONAL DATA: Characterization data for 2 pedons (FS62-Ore-045-13 (1-4) and FS63-Ore-045-25 (1-4)) by Oregon State University. (Unpublished)
National Cooperative Soil Survey
U.S.A.