LOCATION OVIDCREEK IDEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, frigid Aquic Natrixerolls
TYPICAL PEDON: Ovidcreek silt loam, nonirrigated pasture; on a 1 percent slope at 5,925 feet elevation. When described on October 30, 1990, the soil was moist below 2 inches. (Color is for air dry soil unless otherwise noted.)
A1--0 to 2 inches; gray (10YR 5/1) silt loam, black (10YR 2/1) moist; strong medium and thick platy structure parting to moderate fine and medium subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and few fine roots; many very fine irregular and few very fine and fine tubular pores; moderately effervescent; disseminated lime (15 percent calcium carbonate equivalent); moderately alkaline (pH 8.1); abrupt smooth boundary. (2 to 10 inches thick)
A2--2 to 5 inches; dark gray (10YR 4/1) silt loam, black (10YR 2/1) broken and very dark gray (10YR 3/1) crushed moist; weak fine and medium subangular blocky structure parting to moderate very fine granular; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; many very fine irregular and common very fine tubular pores; moderately effervescent; disseminated lime (25 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); abrupt smooth boundary. (0 to 3 inches thick)
Btkn1--5 to 11 inches; gray (10YR 5/1) silty clay loam, black (N 2/) broken and very dark gray (10YR 3/1) crushed moist; moderate medium prismatic structure parting to strong very fine and fine subangular blocky; slightly hard, very friable, moderately sticky and moderately plastic; common very fine, fine and medium roots; many very fine tubular pores; common distinct clay films on faces of peds and in pores; moderately effervescent; disseminated lime and lime segregated into common fine and medium irregularly shaped soft masses (25 percent calcium carbonate equivalent); sodium absorption ratio of 25; moderately alkaline (pH 8.2); clear wavy boundary. (5 to 8 inches thick)
Btkn2--11 to 17 inches; gray (10YR 6/1) silty clay loam, black (N 2/) broken and dark gray (10YR 4/1) crushed moist; strong medium columnar structure parting to strong medium and coarse subangular blocky; hard, very friable, moderately sticky and moderately plastic; common very fine, fine and medium roots; many very fine and few fine tubular pores; many distinct clay films on faces of peds and in pores; moderately effervescent; disseminated lime and lime segregated into common medium and large irregularly shaped soft masses (25 percent calcium carbonate equivalent); sodium absorption ration of 25; moderately alkaline (pH 8.3); clear wavy boundary. (3 to 6 inches thick)
Bkn--17 to 24 inches; light gray (10YR 7/1) silt loam, grayish brown (2.5Y 5/2) moist; weak coarse prismatic structure parting to strong very fine and fine subangular blocky; slightly hard, very friable, moderately sticky and moderately plastic; common very fine and fine and few medium roots; many very fine and few fine tubular pores; violently effervescent; disseminated lime (35 percent calcium carbonate equivalent); sodium absorption ratio of 30; very strongly alkaline (pH 9.4); abrupt smooth boundary. (6 to 8 inches thick)
Btkn--24 to 38 inches; gray (10YR 6/1) silty clay loam, 60 percent gray (10YR 5/1) and 40 percent brown (7.5YR 5/4) broken and dark gray (10YR 4/1) crushed moist; weak thick and very thick platy structure parting to moderate medium and coarse subangular blocky; hard, very friable, moderately sticky and moderately plastic; common very fine roots; many very fine and few fine tubular pores; many distinct clay films on faces of peds and in pores; strongly effervescent; disseminated lime (45 percent calcium carbonate equivalent); 1 percent snail shells; sodium absorption ratio of 30; very strongly alkaline (pH 9.2); abrupt smooth boundary. (0 to 14 inches thick)
Bkn1--38 to 61 inches; light gray (10YR 7/2) silt loam, brown (10YR 5/3) crushed moist; many fine and medium prominent light brownish gray (2.5Y 6/2) redox depletions and brown (7.5YR 5/4) moist redox concentrations; massive; hard, friable, moderately sticky and moderately plastic; few very fine and fine roots; many very fine and common fine and medium tubular pores; strongly effervescent; disseminated lime (45 percent calcium carbonate equivalent); sodium absorption ratio of 40; strongly alkaline (pH 9.0); clear wavy boundary. (6 to 23 inches thick)
Bkn2--61 to 67 inches; very pale brown (10YR 7/3) very fine sandy loam, brown (10YR 5/3) moist; many fine and medium prominent brown (7.5YR 4/2) and light brownish gray (2.5Y 6/2) moist redox depletions; massive; hard, friable, nonsticky and nonplastic; few very fine and fine roots; many very fine and few fine tubular pores; few fine black (N 2/) manganese concretions; strongly effervescent; disseminated lime and segregated lime in few fine irregularly shaped soft filaments (30 percent calcium carbonate equivalent); sodium absorption ratio of 30; strongly alkaline (pH 8.9).
TYPE LOCATION: Bear Lake County, Idaho; about 1 mile west of the Bear Lake airport; about 500 feet west and 50 feet north of the southeast corner of sec. 25, T. 13 S., R. 43 E.; 42 degrees, 15 minutes, 23 seconds north latitude, 111 degrees, 22 minutes, 4 seconds west longitude.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 7 to 18
Depth to natric horizon - 2 to 13 inches
Thickness of natric horizon - 8 to 14 inches
Average annual soil temperature - 41 to 45 degrees F
Depth to redox features - 30 to 40 inches
Depth to high water table - 30 to 40 inches (March through July)
Particle-size control section:
Clay content - averages 28 to 35 percent
A horizons
Hue - 10YR or 2.5Y
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 1 or 2 dry and 1 through 3 moist
Calcium carbonate equivalent - 0 to 25 percent
Reaction - slightly or moderately alkaline
Btkn1 horizon
Hue - 10YR, 7.5YR, 2.5Y or N
Value - 5 or 6 dry, 2 through 4 moist
Chroma -1 through 3 dry and 0 through 4 moist
Calcium carbonate equivalent - 5 to 25 percent
Reaction - moderately or strongly alkaline
Sodium absorption ratio - 15 to 30
Btkn2 horizon
Hue - 10YR, 7.5YR or N
Value - 5 through 7 dry, 2 through 6 moist
Chroma -1 through 3 dry and 0 through 4 moist
Calcium carbonate equivalent - 10 to 30 percent
Reaction - moderately or strongly alkaline
Sodium absorption ratio - 15 to 30
Btkn horizons (absent in some pedons)
Hue - 10YR or 7.5YR
Value - 4 or 5 moist
Chroma -1 or 2 dry and 1 through 4 moist
Calcium carbonate equivalent - 20 to 45 percent
Reaction - strongly or very strongly alkaline
Sodium absorption ratio - 10 to 50
Bkn and Bkn Horizons
Hue - 10YR, 7.5YR, 5Y or 2.5Y
Value - 5 through 7 moist
Chroma - 1 through 4 dry or moist
Texture - SIL, SICL or VFSL
Calcium carbonate equivalent - 25 to 45 percent
Reaction - strongly or very strongly alkaline
Sodium absorption ratio - 10 to 50
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Ovidcreek soils are on slightly elevated lake and stream terraces. Slopes range from 0 to 2 percent. Elevations range from 5,900 to 6,100 feet. The soil formed in reworked silty alluvium from loess and lacustrine deposits. The average annual precipitation ranges from 12 to 16 inches, the average annual air temperature is 39 to 43 degrees F and the frost free season is 65 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bear Lake, Lago (T) and Thatcherflats (T) series. Bear Lake and Lago soils lack natric horizons. Bear Lake soils have an aquic moisture regime. Lago soils have water tables at 18 to 36 inches. Thatcherflats soils lack a mollic epipedon and are somewhat poorly drained. Bear Lake soils are in poorly drained depressional to flat positions. Lago soils are on slightly convex to smooth areas on low terraces and are in complex with Bear Lake soils. Thatcherflats soils occur on terraces on positions slightly lower than Ovidcreek soils.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; slow permeability; rare flooding for brief periods March through July.
USE AND VEGETATION: Ovidcreek soils are used for nonirrigated pasture. The potential natural vegetation is rabbitbrush, bunchgrass, and greasewood.
DISTRIBUTION AND EXTENT: Southeastern Idaho. The soils of this series are not extensive. MLRA 13.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bear Lake County, Idaho, 2008. The name is after a local creek.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to 11 inches (the A1, A2, and Btkn1 horizons)
Natric horizon - the zone from 5 to 17 inches (the Btkn1 and Btkn2 horizons)
Particle-size control section - the zone from 5 to 17 inches (the Btkn1 and Btkn2 horizons)
NSSL # S91ID007003 (partial characterization)