LOCATION SUNNYBROOK              WA

Tentative Series
IRD. MGR/MPR
01/2025

SUNNYBROOK SERIES

Landscape--mountains
Landform--colluvial aprons and glacial valley walls
Slope--15 to 100 percent
Parent material--colluvium from metasedimentary rock
Mean annual precipitation--about 2500 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Typic Dystrudepts

TYPICAL PEDON: Sunnybrook gravelly loam on a south facing, forested glacial valley wall with a slope of 60 percent and an elevation of 1200 meters (The soil was moist throughout when described)

Oi--0 to 4 cm; slightly decomposed plant material; abrupt wavy boundary

A--4 to 28 cm; brown (7.5YR 4/4) dry, brown (7.5YR 4/3), gravelly loam; weak fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; many very fine and fine, and common medium and coarse roots; many fine irregular pores; 20 percent gravel, 5 percent cobbles, very strongly acid (pH 4.7); clear wavy boundary

Bw1--28 to 60 cm; brown (7.5YR 4/4) dry, dark brown (7.5YR 3/4), gravelly loam; weak fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; common fine, medium, and coarse roots; many fine irregular pores; 25 percent gravel, 5 percent cobbles, very strongly acid (pH 4.8); clear wavy boundary

Bw2--60 to 93 cm; brown (7.5YR 5/4) dry, brown (7.5YR 4/4), very gravelly loam; moderate fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; common fine and medium roots; many very fine and fine irregular pores; 35 percent gravel, 15 percent cobbles, very strongly acid (pH 4.9); clear wavy boundary

Bw3--93 to 150 cm; brown (7.5YR 5/4) dry, brown (7.5YR 4/4), very gravelly loam; moderate fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; few very fine roots; many fine irregular pores; 30 percent gravel, 10 percent cobbles, strongly acid (pH 5.1)

TYPE LOCATION: Olympic National Park, Clallam County, Washington; Hurricane Hill Trail, approximately 4 miles from Elwha Ranger Station
Latitude--47.996292
Longitude-- -123.566571
Datum--WGS84

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--5 to 8 degrees C
Mean summer soil temperature--6 to 10 degrees C

Particle-size control section
*Clay content--7 to 15 percent
*Total rock fragment content--35 to 60 percent
*Gravel content--35 to 60 percent
*Cobble content-- 0 to 15 percent

Oi or Oe horizon
Thickness--0-5 cm

A horizon
Hue--10YR or 7.5YR
Value--2 to 4 dry or moist
Chroma--3 to 5 dry or moist
Fine-earth texture--silt loam, loam, sandy loam
Clay content--8 to 17 percent
Total rock fragment content--15 to 35 percent
Gravel content--15 to 35 percent
Cobble content--0 to 10 percent
Reaction--4.5 to 5.5
Thickness--10 to 30 cm

Bw horizons
Hue--10YR, 7.5YR, or 5YR
Value--3 or 4 moist, 4 or 5 dry
Chroma--3 to 5, moist or dry
Fine-earth texture--loam, sandy loam
Clay content--8 to 17 percent
Total rock fragment content--30 to 60 percent
Gravel content--20 to 40 percent
Cobble content--0 to 20 percent
Reaction--4.5 to 5.5
Combined Thickness--120 to 140 cm

COMPETING SERIES:
Blodget--lithic contact within 50 cm of the soil surface
Eveleth--has Cd horizons within the particle size control section with massive structure and bulk density greater than 1.8
Owlridge and Rilea--lithic contact within 100 cm of the soil surface
Shagawa--has C horizon within particle size control section with loamy sand or coarser texture
Twogirls-all horizons in particle size control section have moderately acid reaction class; pH 5.5 to 6.5

GEOGRAPHIC SETTING:
Elevation--700 to 1250 m
Climate--warm, dry summers; cool, wet winters
Mean annual precipitation--1250 to 1750 mm
Mean annual air temperature--7 to 11 degrees C
Frost-free period--90 to 150 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Bonjonpass--contains albic and spodic horizons; occurs on lower slope areas of similar landforms
Skookumcreek--andic soil properties; occurs on similar landforms outside of the Olympic rain shadow
Beecreek-Dry--moderately deep; occurs on ridges and bedrock knobs on similar landforms
Mountscott--aquic conditions within 50 cm of the mineral soil surface; depressions on similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation in normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high or very high throughout

USE AND VEGETATION:
Use--wildlife habitat and recreation
Potential natural vegetation--Pacific silver fir, western hemlock, Douglas-fir, vine maple, black huckleberry, oval-leaf huckleberry, common beargrass, deerfoot vanillaleaf, sidebells wintergreen

DISTRIBUTION AND EXTENT: Olympic Mountains, Washington; MLRA 1; medium extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Olympic National Park, Clallam County, Washington 2023; name from Sunny Brook in Olympic National Park

REMARKS:
Diagnostic horizons and other features in this pedon:
*Particle size control section-- zone from 29 to 104 cm
*Ochric epipedon
*Cambic Horizon--zone from 28 to 93 cm

---

National Cooperative Soil Survey
U.S.A.