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<br />..- 0'0 0903 <br /> <br />FINAL MEMORANDUM <br /> <br />TO: <br /> <br />File <br /> <br />November 4, 1996 <br /> <br />FROM: <br /> <br />Meg Frantz <br /> <br />SUBJECT: <br /> <br />Subtask 3.03 - Yampa River Aggregated Irrigation <br />Structures <br /> <br />Introduction <br /> <br />This memo describes the approach and results of Subtask 3.03, Aggregate Irrigation Structures. The <br />objective of lhis task was as follows: <br /> <br />Detennine which diversion structures should be grouped together and decide where the node <br />representing each group's aggregated operations should fit into the river network. <br /> <br />Approach <br /> <br />Twenly-seven aggregation boundaries were idenlified for the Yampa and Green Rivers. These were <br />selected based primarily on gage and baseflow node location, critical administrative reaches, endangered <br />species instream flow reaches, and on an objective lhal aggregalions not exceed 1000 acres. While the <br />scope anticipaled 82 aggregation nodes, the Stale advised Boyle, based upon experience in the White <br />River, that approximalely 25 nodes would be more appropriate. This number is approximalely the total <br />Phase 3 irrigated land divided by 1000. <br /> <br />Several aggregation groupings were adopted, in consultalion wilh the State, in spite of being greater lhan <br />1000 acres: <br /> <br />. ADY_005 Yampa River above Steamboat (1163 acres) Allowed for aggregation from one mainstem <br />gage to the next one, not far out of line from the 1000-acre objective <br /> <br />. ADY_013 Yampa River below Craig (1203 acres) Allowed for aggregalion of Fortification Creek <br />with lhe mains tern, and ended at a significant gage <br /> <br />. ADY _014 East Fork Williams Fork (1492 acres) Subdividing further would have meant adding a <br />tributary and adding significant work related 10 baseflow generation <br /> <br />. ADY _020 Little Snake River near Slaler, CO (1388 acres), ADY _022 SIaler Creek (1686 acres), and <br />ADY _023 Little Snake River above Dry Gulch (3982 acres) Many large parcels in lhis area were not <br />modeled explicitly in Phase 2, some lands irrigated in Colorado are under Wyoming diversions and <br />rights (and vice versa), Kent Holt is working on trying to straighlen out and summarize operations <br />along the Slate line bul that information is not now available, leaving large amounts of land <br />aggregaled is the only practical way to approach Little Snake River within this project. <br /> <br />aOVLE <br />