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Subirrigation <br />A reconnaissance study of vegetation failed to identify areas of Subirrigation <br />in the nonalluvial areas. In the alluvial areas, much of the stream bottom is <br />tree covered with the typically associated shrubs and grasses. Most likely, <br />this vegetation receives water from the stream through the coarse sediments, but <br />there are no large expanses of subirrigated land which could be cultivated. <br />SOUTH THOMPSON CREEK <br />~ Unconsolidated Sediments <br />Unconsolidated sediments along South Thompson Creek consist of thin, intermit- <br />tent alluvium as described in the introduction. The alluvium varies in width <br />from 50 to 150 feet, but is generally 100 feet wide. In addition, colluvial <br />deposits occur along this drainage (Sections 1 and 12, T9S R89W) (Drawing <br />D-5-1), which are similar in nature and origin to those in Jerome Park and are <br />• unrelated to stream deposition. <br />Flood-Irrigated Land <br />The only land within this drainage which appears to have been historically <br />irrigated, is approximately 50 acres in Sections 1 and 12, T9S R89W. Water was <br />apparently diverted from South Thompson Creek about a half mile upstream from <br />the land (Drawing D-5-1) and administered via ditch along the uphill side <br />of the land. The 1978 State Engineers Office Tabulation of water rights does <br />not list any records for this area. From inspection, it appears that the land <br />was not used for food crops, but rather grasses and/or hay and is no longer in <br />use. The land is currently owned by the Anschutz Corporation (C. Sherwood, <br />personal comm.) <br />r ~ <br />5-8 <br />