LOCATION BROAD CANYON UT+CO IDEstablished Series
The Broad Canyon series consists of very deep, well drained soils on
lateral moraines and mountainsides. They formed in glacial till from
quartzite, sandstone or shale. Permeability is moderate. Slopes are
20 to 70 percent. The average annual precipitation is about 30 inches
and the average annual air temperature is about 40 degrees F.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Typic Haplocryolls
TYPICAL PEDON: Broad Canyon gravelly loam - woodland. (Colors are for
moist soil unless otherwise noted.)
A1--0 to 4 inches; very dark brown (10YR 2/2) gravelly loam, dark
grayish brown (10YR 4/2) dry; weak medium subangular blocky structure;
slightly hard, friable, slightly sticky; many fine and medium, and
common coarse roots; slightly acid (pH 6.2); clear wavy boundary. (2
to 6 inches thick)
A2--4 to 10 inches; very dark grayish brown (10YR 3/2) gravelly
loam, grayish brown (10YR 5/2) dry; weak medium subangular blocky
structure parting to weak fine granular; slightly hard, friable; many
fine and medium roots; few fine pores; slightly acid (pH 6.3); clear
wavy boundary. (4 to 8 inches thick)
Bt--10 to 16 inches; dark brown 7.5YR 3/3) gravelly loam, light
grayish brown (10YR 6/2) dry; weak coarse subangular blocky structure
parting to moderate fine subangular blocky; hard, friable, slightly
sticky; common fine and medium roots; many fine pores; 30 percent
pebbles; few thin clay films on faces of peds; slightly acid (pH 6.3);
clear wavy boundary. (4 to 12 inches thick)
BC--16 to 24 inches; dark brown (7.5YR 3/3) very gravelly sandy
loam, pinkish gray (7.5YR 6/2) dry; weak medium subangular blocky
structure; slightly hard, friable; common medium and fine roots; 50
percent pebbles and cobbles; slightly acid (pH 6.1); clear irregular
boundary. (6 to 16 inches thick)
2C1--24 to 40 inches; reddish brown (5YR 4/3) very stony loamy
sand, pink (5YR 7/3) dry; single grained; loose; common fine and medium
roots; 50 percent rock fragments, mainly stones; medium acid (pH 6.0);
clear wavy boundary. (10 to 20 inches thick)
2C2--40 to 60 inches; reddish brown (5YR 4/3) very gravelly loamy
sand, pink (5YR 7/3) dry; single grained; loose; few fine and medium
roots; 50 percent pebbles and cobbles; medium acid (pH 6.0).
TYPE LOCATION: Summit County, Utah; 1/2 mile from Ledgefork
Campground; about 300 yards east of main trail, upper Smith Morehouse
Canyon, NW1/2 of SW1/4 of section 16, T.1S., R.8E.
RANGE IN CHARACTERISTICS:
The mollic epipedon ranges from 9 to 16 inches thick. Most commonly
the depth to the very gravelly loamy sand is 24 to 40 inches. The
average annual soil temperature at a depth of 20 inches is 36 to 47
degrees F and the average summer soil temperature is 51 to 59 degrees
F. The rock fragment content ranges from 15 to 70 percent in the A
horizon and 35 to 75 percent in the B and C horizons.
A horizon
Hue- 10YR or 7.5YR
Value- 2 or 3 moist, 2 through 5 dry
Chroma- 2 or 3
It is slightly acid or moderately acid.
Bt horizon
Hue- 10YR, 7.5YR or 5YR
Value- 5 through 7 dry, 3 through 5 moist
Chroma- 2 through 4
It lacks combined color values or chroma moist and dry to qualify for a
mollic epipedon.
Texture - GR-L, GRV-L, GRV-SL, CBV-SL, CBV-L
Clay content - 6 to 18 percent
It is slightly acid to medium acid.
This horizon does not have the required clay increase to qualify for an
argillic horizon.
2C horizons
Hue- 5YR, 7.5YR or 10YR
Value- 4 through 6 moist, 5 through 7 dry
Chroma- 3 through 6
Textures - very stony to gravelly or very gravelly loamy sand, sandy
loam or loam.
Stone lines commonly occur below depth of 20 inches.
COMPETING SERIES: These are the Antrobus, Brickel, Decram, Fairydell,
Farlow, Foxmount, Grafen, Greyback, Handran, Kamack, Maurice, Midlight,
Midfork, Parachute, Sebud, Silvercliff, Sup, Supervisor, Thornburgh,
Tiban, Tineman, and Wareagle(T) series. Antrobus, Fairydell, Handran,
Kamack, Sebud, Sup, and Tiban soils lack the very gravelly loamy sand
layer at depths less than 40 inches. Antrobus, Kamack, Midfork, Sebud,
and Tiban soils have more than 18 percent clay in the particle-size
control section. Antrobus, Fairydell, Grafen, Greyback, Handran,
Maurice, Midlight, Silvercliff, Thornburgh, and Tiban soils are
calcareous and/or are neutral or more alkaline in some layers above
depth of 40 inches. Brickel, Decram, Farlow, Foxmount, Grafen,
Parachute, and Supervisor soils have bedrock at depths of less than 40
inches. Grafen, Handran, and Supervisor soils lack cambic horizons.
Tineman soils lack a Bt horizon that has clay films from secondary
clay. Wareagle soils lack a Bt horizon with clay films and lack a
lithologic discontinuity with coarse textures above a 40 inch depth.
GEOGRAPHIC SETTING: These soils are on lateral moraines or glaciated
mountainsides at elevations of 6,500 to 9,500 feet. In the southern
part of the Idaho Batholith these soils formed in granite colluvium and
occur on north-facing slopes at elevations of 5,000 to 6,500 feet.
Slopes range from 25 to 70 percent. These soils formed in materials
weathered mainly from quartzite, sandstone, and some shale. Average
annual temperature is 36 to 45 degrees F and the average summer
temperature is 50 to 58 degrees F. The frost-free period is 30 to 60
days. Average annual precipitation is 25 to 35 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Agassiz, Elder Hollow,
Foxol, Kiesel, Ledgefork, Lucky Star, Moweba, Norway Flat, and Poleline
soils and the competing Kamack soils. Agassiz, Elder Hollow, and Foxol
soils have bedrock at depths less than 20 inches. Kiesel soils have
natric horizons. Ledgefork soils have sandy-skeletal particle-size
control sections and lack cambic horizons. Lucky Star soils have E
horizons and argillic horizons. Moweba and Poleline soils have mollic
epipedons more than 20 inches thick. Norway Flat soils have argillic
horizons with the upper boundary at depths below 24 inches. Agassiz
and Foxol soils are generally on south and west-facing slopes. The
other associated soils are on positions similar to Broad Canyon soils.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff;
moderate permeability.
USE AND VEGETATION: Used for forest, range, watershed, and wildlife
habitat. Potential vegetation is mainly white fir, Douglas-fir,
serviceberry, snowberry, pachystima, ceanothus, and manzanita.
DISTRIBUTION AND EXTENT: Northeastern Utah, western part of Uinta
Mountains, and south central Idaho. These soils are inextensive.
MLRA OFFICE RESPONSIBLE: Lakewood, Colorado
SERIES ESTABLISHED: Morgan Area, Utah, 1974.
National Cooperative Soil Survey