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<br />Niwot Series <br />The Niwot series is made up of deep, somewhat poorly drained soils that are <br />shallow over gravely sand. These soils formed on low terraces and bottom lands in <br />loamy alluvium superimposed over sand and gravel. Slopes aze 0 to 1 percent. <br />Elevations aze 4,900 to 5,500 feet. The native vegetation is mainly bromegrass and <br />water-tolerant grasses. Annual precipitation is 12 to 18 inches, mean annual air <br />temperature is 48° to 52° F., and the frost-free season is about 140 to 155 days. <br />In a representative profile the surface layer is dark grayish-brown and grayish- <br />brown clay loam and loam, about ] 4 inches thick, that is mottled in the lower part. <br />The underlying material that extends to a depth of 60 inches or more is pale-brown <br />gravely sand that contains many mottles., In the surface layer, soil reaction is mildly <br />alkaline, and below this, it is neutral. <br />Niwot soils have moderate permeability. Available water capacity for the profile <br />is low to moderate. Roots can penetrate to a depth of 60 inches or more, and the <br />seasonal high water table is at a depth of between 6 and 18 inches. <br />Most of this acreage is used for pasture. Some small azeas aze used for irrigated <br />crops, and an increasing number of azeas are used for sand and gravel pits. <br />Representative profile of Niwot clay loam in an area of Niwot soils that has <br />slopes of 0 to 1 percent, located 2,100 feet south and 100 feet west of the center of <br />sec. ] 0, T. 1 N., R. 69 W.: <br />Al l~ to 6 inches, dark grayish-brown (lOYR 4/2) clay loam, very dazk <br />brown (1 OYR 2/2 (when moist; moderate, fine, granular structure; <br />soft, very friable; mildly alkaline; cleaz, smooth boundary. <br />A 12~ to 14 inches, grayish-brown (1 OYR 5/2) loam with common, <br />medium, distinct, strong-brown (7.SYR 5/6) mottles, very dark <br />grayish brown (1 OYR 3/2) when moist; weak, coazse, subangular <br />blocky structure that parts to moderate, fine, granular; slightly <br />hazd, soft, very friable; mildly alkaline; gradual, wavy boundary. <br />IIC-14 to 60 inches, pale-brown (1 OYR 6/3) gravely sand with many, <br />distinct, lazge, strong-brown (7.SYR 5/6) mottles, brown (1 OYR <br />5/3) when moist; single grain; loose dry or moist; neutral. <br />The A horizon ranges from 10 to 20 inches in thickness and <br />from loam to sandy clay loam or clay loam in texture. Depth to <br />underlying sand and gravel ranges from 10 to 20 inches. <br />Western Mobile Lyons - Rockin' WP I-7 <br />