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• <br />Inventory & Eva • ion - Bear River Sand & Grave• 5-77 <br />• <br />• <br /> <br />AREA ~{2 <br />Soils and vegetative information found on proposed pit area: <br />A. Climate -- Precipitation averages 15 to 20 inches per year. Over <br />half occurs as snow. The frost free period is 50 to 90 days. The <br />site becomes somewhat droughty in early summer. Plant growth is <br />most favorable in May and June. <br />H. Elevation and Topography -- The proposed gravel pit occurs at an <br />elevation of about 6,500 feet. The natural slope is nearly <br />level. The area occurs on a river terrace, some 4 to 6 feet <br />above the surrounding bottomland. <br />C. Soils -- The proposed pit a curs on an unnamed mapping unit. The <br />soil is classed as a fluvaquent (49). Loam and sandy loam material <br />overlies sand and gravel at about an 18 - 24 inch depth. The soil <br />is moderately permeable but has a lox to fair waterholding capacity. <br />pH ranges from 6.6 to 7.3. Conductivity is negligible, (~2 mmhos~ <br />cm, at 25° C). <br />D. Plant Community -- River Terrace-The dominant appearing aspect of <br />this site is scattered sagebrush and grasses. Ground cover is 20 <br />percent. Total annual production is estimated at 900 lbs~acre, <br />(air dry weight). Droughty conditions through most of the growing <br />season limit production. This area appears to have been Irrigated <br />at some time in the past. The present vegetation is mostly native <br />plants. <br />Species occurring on the site are listed below. <br />Shrubs: Big sagebrush (Artemisia tridentate) <br />Grasses: Western xheatgrass <br />Kentuc}~y bluegrass <br />Redtop <br />Sedge <br />Slender wheatgrass <br />Timothy <br />Smooth bmme <br />Agropyron smithii) <br />Poe pratensis <br />Agrostia alba) <br />Carex sp.~- <br />Agropyron trachycaulum) <br />Phleum ratensis <br />Bromus inermis <br />Forbs: Alfalfa <br />Lupine <br />False lupine <br />Blue bells <br />Blue-eyed grass <br />Wooly mullein <br />Yarrow <br />Dandelion <br />Firexeed <br />Western coneflower <br />s~atav~ia) <br />6j~. <br />iuro <br />i6 <br />