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The lower portion of Dry Creek is very different from the upper. Once the stream leaves <br />the mountains, it passes through a much wider zone of alluvial materials. 'As it leaves <br />the mountains, Dry Creek passes through an irrigated agricultural area that is used) <br />primarily for production of alfalfa and grass hay. These areas are partly on Dry Creek <br />additional <br />n 2 alfalfa fields (Section 22) east of the highway and north of Dry Creek. ;Water from Dry <br />??-?, Creek contributes only a small portion of the water diverted into Dry Creek Ditch with the ' <br />-rest derived from reservoir flood irrigation sys ems. Za ~ <br />k <br />-DCT t <br />?-o-?y- <br />( 1 Downstream from the irrigated alfalfa fields is a field used for dryland agriculture <br />t (northeast corner of Section 22 and northwest corner of Section 23). This field was used <br />for the production of a small grain crop in 1990. Small grain crops are not irrigated. <br />Gulch, an unnamed Gulch, and Dill Gulch run together to form the western edge of the <br />allcenteuvirum, of the but the north fieledgeds aofre itherarirea (gated wibottomth of water fSectionrom J21.)C.. At Templeapproxi'Reservoimatelr y A1t#1-.) this poi Temple <br />agricultural area. ;Dry Creek has been channe l.ized and crosses the center of point, the; <br />agDryriculCreektural Ditch area is di mostly as diverted a to ditctheh. east. Dry This Creek ditch merges is with used the to irrigate other draitwonage along the <br />The fields are topographically too high to be subirrigated. -Based on the historical use, <br />of the area, it appears that the flow that can be diverted in Dry Creek Ditch is not <br />sufficient to irrigate any more acres than those currently being used to irrigate the <br />'alfalfa fields.) <br />Downstream from the dryland agricultural fields, there are areas (Sections 14 and 15) of <br /> <br />native rangeland that support greasewood shrubland s. These areas are quite <br />saline/alkaline and have salt deposits on the surface. They are not subirrigated. <br />Downstream from the greasewood shrublands, the ground water is closer to the surface, and ? <br />the stream channel is not so deeply incised. At this point (southeast quarter of Section <br />10), there is water flowing in the stream, and it is diverted into two separate ditches <br />(Walker Ditch Nos: 1 and 2). The water from these ditches is used to irrigate grass hay <br />fields just east of the fairgrounds in Hayden. It is also possible that these fields are <br />subirrigated. <br />Sage Creek is very similar to Dry Creek. The upper portions of the stream occur in a <br />narrow mountain valley. These portions are subirrigated where the stream channel is not <br />deeply incised. Also, the activity of beavers keeps the soils and valley fill deposits <br /> <br />17