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<br />The Grassy Creek valley floor from the outcrops of Twentymile <br />Sandstone downstream to Routt County road #27 appeazs to be <br />the only portion deserving a detailed study for possible Allu- <br />vial Valley Floor designation. <br />Positive Flood Irrigation Criteria <br />a. Adequate headwaters and water is stored. (Water rights in <br />Grassy belong to another landowner). <br />b. Could be spray irrigated if adequate surface or ground <br />water were available. <br />c. Probably 20 acres could be irrigated. <br />Negative Flood Irrigation Criteria <br />a. No ditches. <br />b. No diversion points. <br />c. No record of filing of water rights. <br />d. No vegetative changes. <br />e. No wells or pumps. <br />• f. No diversion from other drainages. <br />g. No known irrigation is practiced in similar valleys <br />(size, shape, slope and stream entrenchment) within <br />a 2 mile radius. <br />h. Depth from stream channel and arroyos would create <br />erosion problems from any type of irrigation. <br />i. Size of potentially irrigable plots (4-5 acre areas) <br />are small for the investment. Economically unsound. <br />Subirrigated Lands on Grassy Creek <br />Subirrigated bottom land is shown on the map. It is restricted <br />to a nazrow belt of a few feet on either side of the active <br />stream throughout the specific study area. An area west and <br />immediately adjacent to Routt County road #27 contains about 2 <br />acres of subirrigated land. These azeas all contain grass <br />suites typical of this environment in Rautt Covnty. <br />• <br />V-14 <br />