LOCATION RICA WA
Tentative Series
IRD. AJF/MGR/MPR
01/2025
RICA SERIES
Landscape--river valleys
Landform--alluvial terraces and colluvial aprons
Slope--0 to 15 percent
Parent material--alluvium or colluvium
Mean annual precipitation--about 2500 mm
Mean annual air temperature-- about 12 degrees C
Depth class--very deep
Drainage class--somewhat poorly drained
Soil moisture regime--aquic
Soil temperature regime--isomesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-loamy, mixed, active, acid, isomesic Typic Humaquepts
TYPICAL PEDON: Rica silt loam in a depression on a forested alluvial terrace with a slope of 3 percent and an elevation of 105 m. (The soil was wet throughout when described.)
Oi--0 to 4 cm; slightly decomposed plant material; abrupt wavy boundary
Oa--4 to 8 cm; highly decomposed plant material; abrupt wavy boundary
A--8 to 28 cm; dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2); silt loam; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; weakly smeary; common very fine and fine, and few medium roots; common very fine tubular pores; very strongly acid (pH 4.9); clear smooth boundary
Bg1--28 to 56 cm; grayish brown (10YR 5/2) dry, dark grayish brown (10YR 4/2); silt loam; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; common very fine and fine, and few medium roots; common very fine and few fine tubular pores; 10 percent distinct brown (7.5YR 4/4) masses of oxidized iron in matrix; very strongly acid (pH 5.0); abrupt wavy boundary
Bg2--56 to 72 cm; light yellowish brown (10YR 6/4) dry, pale brown (10YR 6/3); sandy loam; moderate fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; few very fine roots; common fine tubular pores; 5 percent prominent grayish brown (10YR 5/2) iron depletions in matrix and 15 percent prominent dark brown (7.5YR 3/4) masses of oxidized iron in matrix; 5 percent gravel; very strongly acid (pH 5.2); abrupt wavy boundary
Bg3--72 to 150 cm; light olive brown (2.5Y 5/4) dry, olive brown (2.5Y 4/4); sandy loam; moderate fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; few very fine roots; common very fine tubular, and few very fine interstitial pores; 8 percent prominent grayish brown (10YR 5/2) iron depletions in matrix and 5 percent prominent strong brown (7.5YR 4/6) masses of oxidized iron in matrix; 5 percent gravel; very strongly acid (pH 5.3)
TYPE LOCATION: Olympic National Park, Jefferson County, Washington; North Shore Quinault Road, approximately 1/2 mile north on unnamed spur road to Big Creek
Latitude--47.540772
Longitude-- -123.718032
Datum--WGS84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--10 to 15 degrees C
Mean summer soil temperature--12 to 17 degrees C
Depth to redoximorphic features--25 to 50 cm below mineral soil surface
Umbric epipedon thickness--18 to 30 cm
Particle-size control section
*Clay content--8 to 17 percent
*Gravel content--0 to 25 percent
O horizons
Horizon designation--Oi, Oe, or Oa
Combined thickness--6 to 12 cm
A horizon
Value--2 or 3 moist; 3 or 4 dry
Chroma--1 or 2 moist or dry
Fine-earth texture--silt loam, loam
Clay content--8 to 17 percent
Gravel content--0 to 15 percent
Reaction--4.5 to 5.5
Thickness--18 to 25 cm
Bg1 and Bg2 horizons
Hue--10YR or 2.5Y
Value--4 to 6 moist or dry
Chroma--1 to 3 moist or dry
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 17 percent
Gravel content--0 to 15 percent
Reaction--4.5 to 5.5
Combined thickness--40 to 60 cm
Bg3 horizon
Hue--10YR or 2.5Y
Value--3 to 6 moist or dry
Chroma-- 3 to 5 moist or dry
Fine-earth texture--sandy loam, loam
Clay content--8 to 17 percent
Gravel content--0 to 25 percent
Reaction--4.5 to 5.5
Thickness--65 to 85 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--50 to 300 m
Climate--warm, moist summers; mild, wet winters
Mean annual precipitation--2000 to 3000 mm
Mean annual air temperature--10 to 14 degrees C
Frost-free period--180 to 240 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Hatana--has cambic horizon; occurs on similar landforms with less frequent flooding
Muscott--somewhat excessively well drained; occurs on similar landforms
Mountmeany--has umbric epipedon and coarse loamy particle size class; occurs on similar landforms with less frequent flooding
Cragcreek--has sandy-skeletal particle size class; occurs on similar landforms
Marymere--has loamy-skeletal particle size class and ochric epipedon; occurs on similar landforms with less frequent flooding
Jolleycreek--has albic and spodic diagnostic horizons; occurs on similar landforms
Saghalie--has loamy skeletal particle size class and andic properties; occurs on similar landforms
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained
Saturation in normal years--above the surface November through February, seasonally high water table top depth of 25 to 50 cm March to April, 50 to 100 cm May through July, and no saturation August through October
Flooding--none, very rare, or rare
Ponding--occasional, brief
Saturated hydraulic conductivity (Ksat)--high or very high throughout
USE AND VEGETATION:
Use--wildlife habitat and recreation
Potential natural vegetation--Sitka spruce, western hemlock, western redcedar, red alder, salmonberry, devilsclub, ladyfern, American skunkcabbage, sedge
DISTRIBUTION AND EXTENT: Olympic Mountains and Coast, Washington; MLRA's 1 and 4a; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Olympic National Park, Jefferson County, Washington 2023; name from Rica Canyon in Olympic National Park
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 33 to 108 cm
*Umbric epipedon--zone from 8 to 28 cm
*Redoximorphic features--zone from 28 to 150 cm
National Cooperative Soil Survey
U.S.A.