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' 142 Soil Survey
<br /> formed in alluvium derived from mixed rock sources. landscape; Wisflat, Arburua, and San Timoteo soils on
<br /> Elevation is 40 to 240 feet. The average annual mountains; Cortina soils and very shallow to deep,
<br /> precipitation is about 16 inches, the average annual air loamy, gravelly or very gravelly soils in drainageways;
<br /> temperature is about 60 degrees F, and the average and, in the higher landscape positions, Xerorthents that
<br /> ' frost-free period is about 270 days. are not flooded. Included areas make up about 15
<br /> Typically, the surface layer is brown sandy loam or percent of the total acreage.
<br /> gravelly sandy loam about 14 inches thick. The The Xerofluvents are very deep and are well drained
<br /> underlying material to a depth of 60 inches is stratified or somewhat excessively drained. They formed in
<br /> ' pale brown sandy loam, loamy sand, fine sandy loam, alluvium derived from mixed rock sources. Typically, the
<br /> silt loam, and silty clay loam. In some areas the surface surface layer is about 20 inches of brown very gravelly
<br /> layer is loamy sand. loam and gravelly sandy loam. The upper 13 inches of
<br /> Included in this unit are small areas of Columbia the underlying material is stratified, pale brown very
<br /> soils; Riverwash; Pits, gravel; and Dumps, tailings. gravelly loamy coarse sand. The lower part to a depth
<br /> These areas are in landscape positions similar to those of 60 inches is stratified, pale brown very gravelly sandy
<br /> of the Xerofluvents. They make up about 15 percent of loam and very gravelly loamy coarse sand. In some
<br /> ' the total acreage. areas the surface layer is sand, loamy sand, sandy
<br /> Permeability is slow to rapid in the Xerofluvents loam, silt loam, gravelly sand, gravelly loamy sand,
<br /> because of the variability of the substratum. Available gravelly sandy loam, gravelly loam, or gravelly clay
<br /> ' water capacity is low or moderate. The effective rooting loam.
<br /> depth is 60 inches or more. Runoff is slow, and the Permeability is slow to rapid in the Xerofluvents
<br /> hazard of water erosion is slight. The soils are subject because of the variability of the substratum. Available
<br /> to frequent, long periods of flooding from December water capacity is very low to high. The effective rooting
<br /> through June. Channeling and deposition are common depth is 60 inches or more. Runoff is slow, and the
<br /> along streambanks. hazard of water erosion is slight. The soils are subject
<br /> This unit is used for wildlife habitat. It may provide to occasional, brief periods of flooding from December
<br /> ' wetland functions and values. These should be through March. Channeling and deposition are common
<br /> considered in plans for enhancement of wildlife habitat along streambanks.
<br /> or land use conversion. The Xerorthents are very deep and are well drained
<br /> This map unit is in capability subclass Vllw or somewhat excessively drained. They formed in
<br /> (MLRA-17), nonirrigated. It is in vegetative soil group J. alluvium derived from mixed rock sources. Typically, the
<br /> surface layer is pale brown gravelly sandy loam about 4
<br /> 278—Xerotiuvents•Xerorthents complex, 1 to 8 inches thick. The underlying material to a depth of 60
<br /> percent slopes, occasionally flooded. These nearly inches is light brownish gray very gravelly sandy loam
<br /> level to moderately sloping soils are on alluvial fans, in and gravelly sandy loam. In some areas the surface
<br /> arroyos, in intermittent stream channels, and in areas of layer is sand, loamy sand, sandy loam, loam, or
<br /> gravel tailing deposits. Slopes are plane or convex on gravelly sand.
<br /> ' alluvial fans and in arroyos and complex in stream Permeability is slow to rapid in the Xerorthents
<br /> channels and in areas of gravel tailing deposits. These because of the variability of the substratum. Available
<br /> deposits are 5 to 25 feet high and have moderately water capacity is very low to high. The effective rooting
<br /> steep or steep slopes. The native vegetation is mainly depth is 60 inches or more. Runoff is slow, and the
<br /> annual grasses and (orbs, but a few areas support hazard of water erosion is slight or moderate. The soils
<br /> riparian trees and shrubs. Elevation is 150 to 800 feet. are subject to occasional, brief periods of flooding from
<br /> The average annual precipitation is 9 to 13 inches, the December through March.
<br /> average annual air temperature is about 61 degrees F, This unit is used for livestock grazing or wildlife
<br /> and the average frost-free period is about 270 days. habitat. It may provide wetland functions and values.
<br /> This unit is 50 percent Xerofluvents and 35 percent These should be considered in plans for enhancement
<br /> ' Xerorthents. The components of this unit occur as areas of wildlife habitat or land use conversion.
<br /> so intricately intermingled that it was not practical to General management considerations in the areas
<br /> map them separately at the scale used. used for livestock grazing include the very low or low
<br /> Included in this unit are small areas of Riverwash; available water capacity in some areas and the content
<br /> Dumps; Pits, gravel; and exposed bedrock. These areas of rock fragments in the surface layer. The occasional
<br /> are in landscape positions similar to those of the flooding is a hazard. The vegetation in most areas is
<br /> Xerofluvents and Xerorthents. Also included are small mainly red brome and filaree. The very low or low
<br /> ' areas of Urban land on the slightly higher parts of the available water capacity limits the production of
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