LOCATION PAVOHROO ID+WY
Established Series
Rev. RAS/CBR
10/2026
PAVOHROO SERIES
The Pavohroo series consists of deep and very deep well drained soils that formed in slope alluvium and colluvium derived from sedimentary and metasedimentary rocks; some with loess influence. These soils are on mountains, mountain slopes, hills, hillslopes, eroded fan remnants, swales, colluvial aprons, and ridges. Slopes are 0 to 70 percent. The mean annual precipitation is about 650 mm, and the mean annual temperature is about 3.9 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Pachic Haplocryolls
TYPICAL PEDON: Pavohroo loam--in forestland. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 3 cm; black (10YR 2/1) moderately decomposed needles and leaves, abrupt wavy boundary.
A1--3 to 10 cm; very dark gray (10YR 3/1) loam, black (10YR 2/1) moist; moderate fine granular structure; soft, friable, slightly sticky, slightly plastic; many fine and medium roots; many very fine and fine irregular pores; slightly acid (pH 6.4); clear smooth boundary.
A2--10 to 25 cm; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; weak medium suangular blocky structure parting to moderate medium granular; slightly hard, friable, slightly sticky, slightly plastic; common fine and medium roots; many very fine and fine tubular pores; slightly acid (pH 6.4); gradual smooth boundary.
A3--25 to 46 cm; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure parting to moderate coarse granular; slightly hard, friable, slightly sticky, slightly plastic; common fine and medium roots; many very fine and fine pores; 5 percent angular limestone gravel, slightly acid (pH 6.4); gradual smooth boundary.
AB--46 to 69 cm; dark grayish brown (10YR 4/2) light clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium and fine subangular blocky structure; hard, firm, slightly sticky, slightly plastic; common fine and medium roots; many very fine and fine tubular pores; 10 percent angular limestone gravel; slightly acid (pH 6.4); clear wavy boundary.
Bw1--69 to 94 cm; grayish brown (10YR 5/2) gravelly clay loam, dark grayish brown (10YR 4/2) moist; moderate medium subangular blocky structure; hard, firm, slightly sticky, slightly plastic; common fine and medium roots; many very fine and fine tubular pores; about 20 percent limestone gravel; noncalcareous except limestone fragments; slightly acid (pH 6.5); gradual wavy boundary.
Bw2--94 to 114 cm; brown (10YR 5/3) gravelly clay loam, dark grayish brown (10YR 4/2) moist; weak fine subngular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; few fine and medium roots; many very fine and fine tubular pores; about 30 percent limestone gravel; noncalcareous except limestone fragments; slightly acid (pH 6.5); gradual wavy boundary.
C--114 to 145 cm; brown (10YR 5/3) gravelly loam, dark grayish brown (10YR 4/2) moist; massive; slightly hrd, friable, slightly sticky, slightly plastic; few fine and medium roots; many very fine and fine tubular pores; about 35 percent limestone gravel; slightly effervescent; slightly alkaline (pH 7.6); abrupt wavy boundary.
R--145 cm; fractured limestone bedrock.
TYPE LOCATION: Bingham County, Idaho; aUSGS Miner Creek topographic quadrangle; latitude 43.220826 degrees north, longitude 111.881761 degrees west, datum WGS84.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3.3 to 6.7 degrees C.
Thickness of mollic epipedon--40 to 114 cm
Depth to bedrock--100 to more than 150 cm
Depth to carbonates--100 to more than 150 cm
Particle-size control section
Clay content--18 to 30 percent
Total rock fragments--15 to 30 percent
Oe or Oi horizon (when present)
Texture--slightly or moderately decomposed plant material
Reaction--pH 4.5 to 5.5
Organic matter content--55 to 100 percent
Thickness--0 to 12 cm
A horizon
Value--3 to 5 dry, 1 to 3 moist
Chroma--1 to 3 dry or moist
Reaction--slightly acid or neutral
Texture (less than 2 mm fraction)--loam, silt loam, clay loam
Clay content--8 to 30 percent
Rock fragments--0 to 35 percent - 0 to 26 percent gravel, 0 to 10 percent cobbles, 0 to 6 percent stones
Reaction--6.1 to 7.3
Thickness--10 to 74 cm
AB horizon
Reaction--slightly acid or neutral
Texture (less than 2 mm fraction)--loam, silt loam, clay loam
Clay content--14 to 30 percent
Rock fragments--15 to 35 percent - 2 to 18 percent gravel, 0 to 10 percent cobbles, 0 to 5 percent stones
Reaction--6.5 to 7.3
Thickness--18 to 56 cm
Bw1 horizon
Hue--10YR or 2.5Y dry or moist
Value--3 to 6 dry, 3 or 4 moist
Chroma--2 to 4 dry or moist
Texture (less than 2 mm fraction)--loam, clay loam, silt loam
Clay content--10 to 32 percent
Rock fragments--2 to 35 percent - 0 to 30 percent gravel, 0 to 30 percent cobbles, 0 to 14 percent stones, 0 to 6 boulders[CR1.1]
Reaction--6.1 to 7.3[RC-NIFI2.1]
Thickness--30 to 74 cm
Bw2 horizon
Hue--10YR or 2.5Y dry or moist
Value--3 to 6 dry, 3 or 4 moist
Chroma--2 to 4 dry or moist
Texture (less than 2 mm fraction)--loam, clay loam, silt loam
Clay content--10 to 32 percent
Rock fragments--12 to 40 percent - 0 to 30 percent gravel, 0 to 30 percent cobbles, 0 to 6 percent stones
Reaction--6.5 to 7.3[RC-NIFI3.1]
Thickness--30 to 74 cm
C horizon (when present)
Value--5 or 6 dry
Chroma--2 to 4 dry or moist
Texture (less than 2 mm fraction)--loam, clay loam
Clay content--15 to 33 percent
Rock fragments--10 to 30 percent - 0 to 70 percent gravel, 0 to 30 percent cobbles, 0 to 14 percent stones, 0 to 9 boulders
Reaction--6.6 to [RC-NIFI4.1]8.4
Effervescence--none to violent
COMPETING SERIES:
Adel (MT)--soils do not have a cambic horizon
Argee (T)(NV)--soils are moderately deep to paralithic contact
Bullbasin (CO)--soil have mean annual soil temperatures less than 3.3 degrees C
Duff (NV)--soils lack Bw horizons
Hackwood (NV)--soils lack Bw horizons
Houlihan (MT)--soils have an ustic moisture regime
Lamphier (CO)--soils have a Bt horizon
Leaveittville (WY)--soils have secondary calcium carbonates
Lespate (CO)--soils are moderately deep to lithic contact
Ohbejoyful (CO)--soils have pHs below 6.4 in the C horizons and have mean annual precipitation greater than 760 mm[CR5.1]
Osmund (WY)--soils have more than 35 percent rock fragments below 76 cm
Rhone (CO)--soils have more than 57 percent sand below the A horizon
Secondset (CO)--soils are moderately deep to lithic contact
Strickland (NV)--soils are moderately deep to lithic contact
Taterheap (CO)--soils have a lithologic discontinuity
Winevada (CO)-- soils are moderately deep to lithic contact
GEOGRAPHIC SETTING:
Landform-- mountains, mountain slopes, hills, hillslopes, eroded fan remnants, swales, colluvial aprons, and ridges
Elevation--1,400 to 2,620 meters
Slope--0 to 70 percent
Parent material--slope alluvium and colluvium derived from sedimentary and metasedimentary rocks; some with loess influence
Climate--long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation-- 360 to 760 mm [CR6.1]
Mean annual air temperature--0.6 to 6.1 degrees C
Frost-free period--30 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; 5 to 15 um/sec.
USE AND VEGETATION: Pavohroo soilS primarily used for grazing and timber production. The potential native vegetation is mainly Douglas-fir, pine reedgrass, and mountain snowberry.
DISTRIBUTION AND EXTENT: Pavohroo soils are of moderate extent in southeastern, Idaho/ MLRAs 13, 43B, 47.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bingham County, Idaho, 1972.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon (pachic)--3 to 69 cm (A1, A2, A3, and AB horizons)
Cambic horizon--69 to 114 cm (Bw1 and Bw2 horizons)
Lithic contact--145 cm (R horizon)
Particle-size control section--26 to 101 cm
Pavohroo soils have a cryic temperature regime and an udic moisture regime. In 2010/2011 the soil moisture regime based on vegetative indicators was considered to be udic. Prior to this date no moisture regime was correlated to the series. All soil surveys in which this series is used need review for udic or xeric soil moisture regime.
National Cooperative Soil Survey
U.S.A.