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L Northwater series The Northwater series consists of deep, well drained soils formed in residuum trom sedimentary rock. North- water soils are on mountainsides. Slopes are 15 to 65 percent The average annual precipitation is about 20 inches, and the average annual air temperature is about 40 degrees F. Northwater soils are similar to Rhone soils. Rhone soils do not have a skeletal control section. Typical pedon of Northwater loam, 15 to 65 percent slopes, about 1,000 feet east and 75 feet north of the southwest corner of section 12, T. 5 S., R. 96 W.: 02-2 inches to 0; oroanic material. A11-0 to 10 inches; brown (10YR 4/3) loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine and very fine roots; neutral: clear smooth boundary. A12-10 to 25 inches; dark grayish brown (tOYR 4/2) loam, very dark brown (tOYR 2/2) moist; moderate fine granular structure; slightly hard, very friable, • slightly sticky and slightly plastic; many fine and very fine roots; 10 percent Iragments which are mainly less than 1 inch in diameter; clear wavy boundary. B2t-25 to 50 inches; light brown (7.SYR 6/4) very chan- nery clay loam, dark brown (7.SYR 4/4) moist; mod- erate medium subangular blocky structure ghat parts to moderate fine subangular blocky; hard, friable, sticky and plastic; common medium and large roots; common thin clay films and organic coats on peds and along root channels; 50 percent channery frag- ments, mostly 3/4 inch t0 3 inches long; neutral; clear wavy boundary. R-50 inches: fractured sandstone. Depth to bedrock is more than 40 inches but generally is less than 60 inches. The mollic epipedon ranges from 20 to 35 inches in thickness. Depth to the top of the argillic horizon is 24 inches or more. Reaction is slightly acid to mildly alkaline throughout. The A horizon has hue of 7.SYR to 2.SY, value of 4 or 5 dry and 2 or 3 moist, and chroma of 2 or 3. Content of rock tragments is generally less than 15 percent. The B horizon has hue of 7.SYR to 2.SY, value of 6 or 7 dry and 4 or 5 moist, and chroma of 3 or 4. Content of rock fragments, which are mostly thin and flat and mainly 3/4 to 3 inches long, ranges from 35 to 65 percent. The C • horizon, where present, has hue of 7.SYR to 2.SY and contains as much as 85 percent rock fragments.