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MAPPING UNIT SEF - NORTHWATER LOAM <br />• 15 TO 65 PERCENT SLOPES <br />This deep, well-drained soil is found on mountain slopes between <br />7600 and 8400 feet elevation. It is formed in residuum from sedi- <br />mentary rocks. The average annual precipitation is about 20 inches, <br />the average frost-free period is less than 75 days. <br />The immediate surface layer usually consists of 2 inches of organic <br />material, contained on top of 25 inches of brown to dark grayish <br />brown loam. The underlying material is light brown, very channery <br />clay loam about 25 inches thick. The soil overlies hard fractured <br />sandstone at 50 inches. The reaction throughout the profile is <br />neutral. <br />The permeability of the Northwater soil is moderate and has an <br />effective rooting depth of 40-60 inches. The available water <br />capacity is moderate, has a slow surface runoff and slight erosion <br />• hazard. The capability subclass is VIe. <br />CLASSIFICATION OF MAJOR COMPONENTS <br />Northwater loam, 15 to 65 percent slopes; Family Loamy - skeletal <br />Mixed Cryic Pachic Paleborolls. <br />INCLUSIONS <br />Included with this soil mapping unit are small areas of Parachute. <br />Rhone and irigul soils make up to 10 to 15 percent of the mapping <br />unit. Rhone soil is found on the north-facing slopes while Para- <br />chute and Irigul are found near ridge crests. <br /> <br />I-8 <br />