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, Q 7 0.33 cfs of water from Sawmill Ditch with an effective priority of 1979. The Thompson Enlargement is not on Federal land; rather it takes water, through a pipe and pump system, from Sawmill Ditch at a point below the wilderness boundary. The previously awarded 6 cfs of absolute rights has, historically, de-watered a small segment of South Willow Creek during periods of low flows. The additional 0.33 cfs may extend the duration of those effects to a slight degree. The Forest Service has no information that indicates that the original diversion from South Willow Creek has been altered in any way, so the Thompson Enlargement is not considered to be a change in the pre-wilderness conditions. All of the five rights described above represent such very small uses of water that they are considered not to have any noticeable effect on the wilderness water resources, particularly any effect that could be quantified. As with all of the absolute water rights, if the Forest Service determines that their continued use would diminish the wilder- ness resources, the Forest Service would seek to acquire by purchase or exchange the water rights and related lands. Further changes in the development works associated with these rights on wilderness or non-wilderness NFS lands will require authorization by the President or the Forest Service, respectively. Conditional Rights. The information concerning conditional water rights is displayed in Appendix II. As shown there, all of these rights are senior to the related wilderness designations with the exception of the conditional water rights of the Denver Water Board. This list does not include those decreed conditional rights related to the Federally authorized and funded Fryingpan-Arkansas Reclamation Project in the Hunter-Fryingpan and Holy Cross Wildernesses or those for the Homestake Project in the Holy Cross Wilderness, all of which were recognized and approved by Congress. See Public Law 87-590, 76 Stat. 389, as amended, 43 U.S.C. 616 (note) (authorizing construction, operation and maintenance of Fryingpan-Arkansas Reclamation Project in accordance with specific operating prinCiples and streamflow reqUire- ments); and, Section 102(a)(5) of Public Law 96-560, 94 Stat. 3266 (establishing Holy Cross Wilderness and disclaiming any effect on the Homestake Project). The water rights related to these projects are displayed in the separate wilderness sections of Appendix III. None of these conditional rights may be developed on non-wilderness or wilderness NFS lands without authorization by the Forest Service or the President, respectively. If any of these rights, whether on Federal or non-Federal lands is implemented in a manner that will adversely affect wilderness values, the management mechanisms dis- cussed below Are availuhle to a.ddress the threat.