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• July 1993 -23- 923-2515 <br />These wetlands aze not managed differently from the surrounding native rangeland. They have <br />not been seeded or enhanced with cultivazs and are not cropped for hay. They aze not <br />recognized as a special unit. <br />5.1.7 Native Rangeland <br />Native rangeland occur continuously along Grassy Creek and extend out of the stream valleys <br />to the adjacent hills (Figure 2). Native rangeland, adjacent to drainages and in areas where the <br />stream channel is not excessively incised, aze flooded during lazge precipitation events. The <br />native rangeland in the lower portion of Grassy Creek is likely not often flooded as the stream <br />channel is incised up to 15 feet in places. Monitoring data is not available to define the ground <br />water depth in these rangelands. However, the incised stream channel, especially along the <br />lower portions of Grassy Creek, likely lowers the ground water table to the level of the stream <br />• channel bottom. <br />The vegetation of the native rangeland along Grassy Creek is a sagebrush shrubland with an <br />herbaceous understory of native and introduced grasses and forts. The community is dominated <br />by one of the following species of sagebrush: silver sagebrush (Artemisia cans), big sagebrush <br />(Artemisia tridentata), and alkali sagebrush (Artemisia longiloba). Western snowberry <br />(Symphoricatpos oreophilus) is often a co-dominant with big and silver sagebrush. Understory <br />species include western wheatgrass (Agropyron smithir), prairie Junegrass (Koeleria macrantha), <br />agassiz bluegrass, and common yarrow (Achilles lanulosa). The dominant species in this <br />community aze all upland plants and indicative of dry upland habitats, not subirrigated areas. <br />The native rangeland along Grassy Creek aze in the mountain Swale, brushy loam, and aspen <br />woodland range site. The mountain Swale range site, in undisturbed condition, is dominated by <br />basin wild rye (Elymus cinereus), slender wheatgrass (Agropyron trachycaulum) and western <br />• wheatgrass and includes a sparse cover of big sagebrush and silver sagebrush. Productivity in <br />this range site varies from 2,000 to 3,000 pounds per acre per yeaz. The severe overgrazing <br />Golder Associates <br />