LOCATION UVI ID

Established Series
Rev. RHB-BDG-EMM
07/2013

UVI SERIES

The Uvi series consists of very deep, well drained soils that formed in loess and material from granitic or metamorphic rocks with an admixture of volcanic ash. Uvi soils are on canyon sides and mountain slopes and have slopes of 5 to 75 percent. The mean annual precipitation is about 28 inches and the mean annual temperature is about 43 degrees F.

TAXONOMIC CLASS: Fine-loamy, isotic, frigid Vitrandic Haploxerepts

TYPICAL PEDON: Uvi ashy loam, forested. (Colors are for dry soil unless otherwise stated.)

Oe--0 to 1 inch; partially decomposed needles and twigs; moderately acid (pH 5.8).

A1--1 to 3 inches; dark grayish brown (10YR 4/2) ashy loam, very dark brown (7.5YR 2.5/2) moist; weak fine and very fine granular structure; soft, firm, non-sticky and slightly plastic; many fine and very fine roots; many fine and very fine irregular pores and common very fine and fine tubular pores; 5 percent fine mica flakes; slightly acid (pH 6.1); abrupt wavy boundary.

A2--3 to 5 inches; brown (10YR 5/3) ashy loam, dark brown (7.5YR 3/2) moist; weak fine and medium granular structure parting to weak medium subangular blocky; slightly hard, friable, non-sticky and moderately plastic; many fine and very fine roots; many fine and very fine irregular pores and common very fine and fine tubular pores; 5 percent fine mica flakes; slightly acid (pH 6.1); abrupt wavy boundary. (combined thickness of the A horizon 4 to 8 inches thick).

Bt1--5 to 8 inches; brown (10YR 5/3) ashy loam, dark brown (7.5YR 3/3) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; many distinct clay films on faces of peds and in pores; many fine and very fine roots along faces of peds, few medium and coarse roots; many fine and very fine irregular pores, common fine and very fine few medium and coarse tubular pores; 10 percent fine mica flakes; moderately acid (pH 6.0); clear wavy boundary.

Bt2--8 to 15 inches; brown (10YR 5/3) loam, brown (7.5YR 4/3) moist; strong medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; many distinct clay films on faces of peds and in pores; common fine and medium roots along faces of peds; common very fine and fine irregular pores, common very fine and fine, few medium tubular pores; 15 percent fine mica flakes; neutral (pH 6.6); clear wavy boundary.

Bt3--15 to 25 inches; very pale brown (10YR 7/4) and light brown (7.5YR 6/4) loam, dark yellowish brown (10YR 4/4) moist and brown (7.5YR 4/4) moist; strong fine medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; common distinct clay films in root channels and pores, many distinct clay films on faces of peds and in pores; common very fine and fine roots along faces of peds and few coarse roots; common fine and very fine irregular and tubular pores; 25 percent fine mica flakes; 2 percent gravel; slightly acid (pH 6.1); clear wavy boundary.

Bt4 --25 to 32 inches; very pale brown (10YR 7/4) loam, yellowish brown (10YR 5/4) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common distinct clay films on faces of peds and in pores; common fine and very fine roots along faces of peds; common very fine and fine irregular and tubular pores; 25 percent fine mica flakes; 5 percent gravel; moderately acid (pH 6.0); clear wavy boundary. (combined thickness of the Bt horizon 20 to 45 inches thick)

BC--32 to 44 inches; light yellowish brown (10YR 6/4) loam, yellowish brown (10YR 5/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few distinct clay films in root channels and pores; common fine and very fine roots along faces of peds; few very fine and fine tubular pores; 30 percent fine mica flakes; 5 percent gravel, 10 percent soft schist fragments; moderately acid (pH 5.9); clear wavy boundary. (0 to 15 inches thick)

C--44 to 61 inches; yellowish brown (10YR 5/4) paragravelly sandy loam, dark yellowish brown (10YR 4/4) moist; massive; slightly hard, friable, non-sticky and non-plastic; common fine and very fine roots throughout; few very fine and fine tubular pores; 70 percent fine mica flakes; 25 percent soft schist fragments; moderately acid (pH 5.9).

TYPE LOCATION: Clearwater County, Idaho, about 6 miles north of Grangemont, ID, about 2000 feet east and 800 feet south of the northwest corner of Sec. 26, T38N, R3E; Latitude - 46 degrees, 36 minutes, 47 seconds North; Longitude - 116 degrees, 02 minutes, 36 seconds West; USGS Grangemont Quadrangle

RANGE IN CHARACTERISTICS:

Base saturation - 40 to 60 percent between depths of 10 and 30 inches
Average annual soil temperature - 41 to 46 degrees F
Average summer soil temperature - 59 to 62 degrees F
Frigid temperature regime
Soil moisture - usually dry for more than 45 consecutive days (mid-July to mid-September)
Xeric moisture regime

Particle-size control section (weighted averages)
Clay content - 18 to 24 percent
Gravel content - 0 to 10 percent

A horizons
Hue - 10YR or 7.5YR moist
Value - 4 to 6 dry, 2.5 to 4 moist
Chroma - 2 to 4 dry, 2 to 4 moist
Clay content - 15 to 20 percent
Textures - ashy-silt loam or ashy-loam
Gravel content - 0 to 2 percent
Reaction - moderately acid to neutral

Bt and BC horizons
Hue - 10YR or 7.5YR moist
Value - 5 to 7 dry, 3 to 5 moist
Chroma - 3 to 6, dry or moist
Texture - silt loam, loam or sandy loam
Gravel content - 0 to 15 percent in the lower part
Clay content - 12 to 25 percent, less than 1.2 times as much clay as the A horizon
Reaction - very strongly acid to neutral

Present in some pedons below 40 inches: C horizon
Hue - 10YR moist or dry
Value - 5 or 6 dry, 3 to 5 moist
Chroma - 3 or 4 dry or moist
Texture - loam, sandy loam, or loamy sand
Clay content - 3 to 24 percent
Gravel content - 0 to 20 percent
Paragravel content - 0 to 25 percent
Reaction - very strongly acid to slightly acid

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING: The Uvi soils are on uplands, canyon sides, and mountainslopes and have slopes of 5 to 75 percent. Elevation is 1,200 to 4,525 feet (316 to 1383 meters). The soils formed in loess and residuum and colluvium from granite or metamorphic rocks with an admixture of volcanic ash. The mean annual precipitation ranges from 22 to 40 inches (559 to 1016 mm). The average annual air temperature is 40 to 46 degrees F. The frost free season ranges from 80 to 130 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Crumarine, Threebear, and Vassar soils. Crumarine soils have a coarse-loamy textured control section and are somewhat poorly drained and are in bottomlands. Threebear soils have a fragipan and formed in volcanic ash over loess. Vassar soils have a mantle of volcanic ash in the surface layers.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; moderately high saturated hydraulic conductivity.

USE AND VEGETATION: Used for woodland, hay and pasture. The natural vegetation is mainly grand fir, Douglas fir, mallow ninebark, common snowberry, elk sedge, and pine reedgrass.

DISTRIBUTION AND EXTENT: Northern Idaho. The series is of moderate extent. MLRA 43A.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Latah County, Idaho, 1979.

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

Ochric epipedon - the zone from 0 to 5 inches (Oe, A1 and A2 horizons)

Cambic horizon - the zone from 5 to 32 inches (Bt1, Bt2, Bt3, and Bt4 horizons)

Particle-size control section - the zone from 10 to 40 inches (part of the Bt1, the Bt2, Bt3, Bt4, and part of the BC horizon)

The ranges in characteristics for the C horizon are for Clearwater County. As of 1/2008, the type location for Uvi has been moved from Latah County to Clearwater County. The Uvi concept as previously mapped in Latah County has been primarily correlated to the Quinnamose, Cobbler, or Kruse series.

National Cooperative Soil Survey
U.S.A.