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1 <br /> <br /> <br /> <br />1 <br /> <br /> <br />1 <br /> <br /> <br />1 <br />1 <br /> <br />1 <br /> <br />1 <br />11 <br /> <br />The vegetation survey was undertaken to identify <br />veyetation indicative of subirrigation (i.e., vegetation <br />dependent on a shallow water table). The results of that <br />survey indicated that the northern end of the study area <br />(i.e., the upper areas of Ward and Williams Creeks) is 7600 <br />feet in elevation. At this elevation, there is substantially <br />more precipitation and cooler temperatures than at the <br />southern end of the study area (which is 2000 feet lower). <br />This, together with changes in parent material from the <br />well-drained, alluvial cobbly loams in the upper end to <br />clayey residuum of the Mancos Shale below, makes changes in <br />vegetation within the study area quite pronounced. <br />Vegetation types range from cool subirrigated hardwood <br />bottoms to hot dry saltbush slopes (see Map 9 - Vegetation <br />Map). (Note: an explanation of each vegetative type included <br />on Map 9 is given in Appendix D.) Irrigated areas on the <br />alluvial fans are the most significant agricultural areas of <br />the land which was mapped. Where plowing has been possible, <br />tame grasses have been planted. In other areas, the pinon, <br />juniper, and scrub oak trees on the mudflow fans have been <br />cleared to promote the growth of native grasses under <br />irrigation. However, most of the fan areas remain in native <br />pinon and juniper. <br />Areas immediately along Ward and Williams Creeks (i.e., <br />first and second terraces and lower fan surfaces near these <br />86 <br /> <br />