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00090B November 4, 1996 Page 3 Comments and concerns Execution of Task 3.03 broughl to light some concern about the curren I model of the Little Snake River basin. The Little Snake River flows more or less parallel to the Wyoming/Colorado State line, leaving and re-entering Colorado twice before turning south 10 the Yampa mainstem. In this area, there are irrigated lands in Wyoming which are served by Colorado rights and vice versa. Kent Holt is working on summarizing operalions in Wyoming, but that information is nol available at this point. The State may want to address several issues related to this area, some of which might be better undertaken when the Commissioner has completed his project: . Many large parcels in this area were not modeled explicitly in the Phase 2 model. Some of them are on tribularies to lhe Little Snake or in lhe headwaters section, well within the Slate, and are served by Colorado rights. The parcels are large enough that one would expect the associated water rights to be above lhe Phase 2 cutoff, but this has nOl been verified. . At the State's direction, lands that are identified as Phase 3 irrigated lands in the spatial dalabase, but which lie in Wyoming, have been excluded from lhe Phase 3 model. However, some parcels lying wholly in Wyoming were included in lhe Phase 2 model. . For the purpose of the Phase 3 model, Phase 3 lands within Colorado bul close toWyoming will be aggregated and served by whatever Colorado water righls are associated with those lands. We anticipate that the lands may be shorted in the model, because some of lhe lands are served by Wyoming rights. If lhis occurs, we will need to make adjustments al calibralion. In the long term, lhe State may want to treat the whole border area in a more detailed way. The degree of resolution in lhis area should be coordinaled with the degree of resolution in the estimale of consumplive use represented at the "Wyoming Demand" node. DN-cn-lOI-02/mf