LOCATION HIVAL UTEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, frigid Ustic Aquicambids
TYPICAL PEDON: Hival silty clay loam, on a level slope in hayland. When described the soil was moist throughout. (Colors are for moist soil unless otherwise noted.)
Al--0 to 5 inches; dark brown (7.5YR 3/4) silty clay loam, brown (7.5YR 4/4) dry; weak medium subangular blocky structure; hard, friable, sticky and plastic; many fine and few medium roots; many fine interstitial pores; strongly calcareous; moderately alkaline (pH 8.3); clear smooth boundary. (4 to 9 inches thick)
B21--5 to 13 inches; dark brown (7.5YR 4/4) clay, brown (7.5YR 5/4) dry; moderate medium subangular blocky structure; very hard, friable, sticky and plastic; common fine and few medium roots; common fine and few medium interstitial pores strongly calcareous; moderately alkaline (pH 8.); clear smooth boundary. (8 to 13 inches thick)
B22--13 to 22 inches; brown (7.5YR 5/4) clay, light brown (7.5YR 6/4) dry; few fine faint mottles; common medium subangular blocky structure; very hard, firm, sticky and plastic; few fine and medium roots; common fine interstitial pores; strongly calcareous; moderately alkaline (pH 8.4); clear smooth boundary. (6 to 12 inches thick)
C1--22 to 32 inches; reddish brown (5YR 5/4) clay, yellowish red (5YR 5/6) dry; common medium faint mottles; massive; very hard, firm, sticky and plastic; few very fine roots; few fine interstitial pores; strongly calcareous; moderately alkaline (pH 8.1); clear smooth boundary. (8 to 10 inches thick)
C2--32 to 60 inches; yellowish red (5YR 5/6) clay, reddish yellow (5YR 6/6) dry; few fine faint mottles; massive; very hard, very firm, sticky and plastic; few fine interstitial pores; strongly calcareous; moderately alka-line (pH 8.2).
TYPE LOCATION: Rich County, Utah; about 2.5 miles southeast of Woodruff; 2,500 feet west and 1,500 feet north of the SE corner of Sec. 23. T. 9 N., R. 7 E.
RANGE IN CHARACTERISTICS: The thickness of the solum ranges from 22 to 33 inches. The mean annual soil temperature is 37 to 40 degrees F., and the mean summer soil temperature if 56 to 59 degrees F. A seasonal water table is between the depths of 18 and 30 inches.
The A horizon has hue of 7.5YR or 5YR, value of 3 or 4 moist, 4 or 5 dry, and chroma of 4. It is moderately or strongly alkaline.
The B2 horizon has hue of 5YR or 7.5YR, value of 4 or 5 moist, 6 or 7 dry, and chroma of 4 or 6. It is a clay averaging 55 to 65 percent clay.
The C horizon has hue of 5YR or 7.5YR, value of 5 or 6 moist, 6 or 7 dry, and chroma of 2 to 6. It commonly is clay averaging 50 to 60 percent clay, but may range to silty clay loam below 40 inches.
CPMPETING SERIES: There are no other soils in this family. A similar soil is the Church series. This soil has a mesic temperature regime.
GEOGRAPHIC SETTING: Hival soils are on alluvial fans and floodplains with slopes of 0 to 2 percent. The soils formed in alluvium derived mainly from weathered sandstone and shale at elevations of 6,250 to 6,400 feet. The mean annual temperature is about 38 to 42 degrees F. and the mean summer temperature is about 59 to 62 degrees F. The average annual precipitation is 9 to 11 inches. Freeze-free period is about 55 to 65 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cowco, Saleratus, and Bear Lake soils. Cowco and Saleratus soils do not have cambic horizons. Bear Lake soils are fine silty and have mollic epipedons.
DRAINAGE AND PERMEABILITY: Poorly drained. Runoff is slow or very slow. Permeability is very slow.
USE AND VEGETATION: These soils are used for irrigated pasture. Vegetation is broadleaf sedges, bluegrass, wiregrass, foxtail and hairgrass.
DISTRIBUTION AND EXTENT: Hival soils are of small extent; about 4,000 acres have been mapped in Northeastern Utah.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Rich County, Utah, 1978. The name is coined.
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