LOCATION HARRINGTON OR
Established Series
Rev. AON/TDT
06/2011
HARRINGTON SERIES
The Harrington series consists of moderately deep, well drained soils that formed in colluvium from basalt and andesite. Harrington soils are on uplands and have slopes of 3 to 90 percent. The mean annual precipitation is 90 inches and the mean annual temperature is 49 degrees F.
TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Typic Humudepts
TYPICAL PEDON: Harrington very gravelly loam, forested. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed litter of Douglas-fir needles, twigs, leaves, and mosses.
A--1 to 6 inches; dark reddish brown (5YR 3/2) very gravelly loam, reddish brown (5YR 4/3) dry; moderate medium and fine granular structure; slightly hard, friable, nonsticky and nonplastic; many very fine, fine and few course roots; many very fine irregular pores; 35 percent fine gravel; moderately acid (pH 5.6); clear wavy boundary. (4 to 10 inches)
Bw1--6 to 13 inches; dark reddish brown (5YR 3/3) very gravelly clay loam, reddish brown (5YR 4/4) dry; moderate fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine, fine and few course roots; common very fine irregular pores; 50 percent coarse gravel; strongly acid (pH 5.2); clear wavy boundary. (5 to 10 inches)
Bw2--13 to 29 inches; dark reddish brown (5YR 3/4) very gravelly clay loam, yellowish red (5YR 4/6) dry; moderate medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine irregular pores; 40 percent coarse gravel; 20 percent cobbles; strongly acid (pH 5.2) clear wavy boundary. (12 to 18 inches)
BC--29 to 35 inches; reddish brown (5YR 4/4) extremely gravelly loam, yellowish red (5YR 5/6) dry; weak medium and fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; common fine and medium irregular pores; 50 percent coarse gravel; 20 percent cobbles; strongly acid (pH 5.2); abrupt wavy boundary. (5 to 10 inches)
R--35 inches; fractured basalt.
TYPE LOCATION: Douglas County, Oregon; about 6 miles northeast of the community of Idelyld Park; 1,300 feet north and 1,350 feet east of the SW corner of secton 9, T. 25 S., R. 2 W.
RANGE IN CHARACTERISTICS: The soils are usually moist and are dry throughout for less than 45 consecutive days during the summer months. The mean annual soils temperature is 47 to 55 degrees F. Depth to bedrock is 20 to 40 inches. The umbric epipedon is 10 to 20 inches thick.
The A horizon has hue of 10YR through 5YR value of 2 or 3 moist, 4 or 5 dry, and chroma of 2 or 3 moist and 3 or 4 dry. It is gravelly or very gravelly loam with 15 to 60 percent rock fragments of which 0 to 15 percent can be cobbles. It is slightly acid or moderately acid.
The B horizon has hue of 7.5YR, 5YR or 2.5YR, value of 3 or 4 moist and 4 through 6 dry and chroma of 2 through 6 moist and dry. It is gravelly or very gravelly clay loam, extremely gravelly loam, or very cobbly loam averaging 25 to 35 percent clay and 35 to 80 percent rock fragments of which 15 to 45 percent are cobbles. It is strongly acid or moderately acid.
COMPETING SERIES: These are the
Brightwood,
Klickitat,
Milbury,
Nordby,
Skoly,
Spivey, Steevers,
Summers, and
Wauld series. Brightwood, Milbury, and Summers soils have a B horizon with less than 18 percent clay. Milbury soils are over sandstone and lack hue redder than 10YR throughout. Klickitat, Nordby, Skoly, Spivey and Steevers soils are deeper than 40 inches to bedrock. Wauld soils have an umbric epipedon 20 to 30 inches thick.
GEOGRAPHIC SETTING: Harrington soils are on uplands and have slopes of 3 to 90 percent. Elevation is 100 to 4,000 feet. The soils formed in colluvium from basalt and andesite. The climate is humid temperate with cool moist winters and warm dry summers. The mean annual precipitation is 55 to 90 inches. The mean January temperature is 37 degrees F., mean July temperature is 63 degrees F., and the mean annual temperature is 45 to 53 degrees F. The frost-free season is 100 to 240 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Blachly,
Honeygrove,
Shivigny,
Kilchis, Kinny,
Orford, and
Zango series and the competing
Klickitat soils. Blachly, Honeygrove, Orford, and Shivigny soils are deep, and fine textured. Kinny soils are deep and fine-loamy. Kilchis and Zango soils are less than 20 inches deep to a lithic contact.
DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability.
USE AND VEGETATION: Timber production, wildlife habitat and watershed. Native vegetation is Douglas-fir, western hemlock, grand fir, salal, vine maple, red huckleberry, and western swordfern.
DISTRIBUTION AND EXTENT: Western Cascade Mountains and south-central Coast Range Mountains in Oregon; MLRA 1 and 3. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Linn County, Oregon, 1983.
REMARKS: Diagnostic horizons and other features;
Umbric epipedon from 1 to 13 inches
Cambic horizon from 13 to 29 inches
National Cooperative Soil Survey
U.S.A.