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(0) Segmentation Criteria For purposes of adopting site-specific designated uses and water quality criteria, the streams and other surface water bodies shall be identified according to river basin and/or sub-basin and specific water segments. Segmertts may constitute a specific stretch of a river mainst,em, a specific tributary, a specific lake or reservoir, or a generally defined grouping of waters within a basin (e.g., a specific mainstem segment and all tributaries flowing into that mainstem segment) . (3) Segments shall generally be delineated according to the points at which the use, physical characteristics or water quality characteristics of a watercourse are determined to change significantly enough to require a change in use classifications. and/or water quality criteria. In many cases, ,such transition points can be specifically identified from available water quality data. In other cases, however, the de~ineation of segments shall be based upon best judgements of where instream changes in uses, physical characteristics or water quality occur, based upon upstream and doWnstream data. (E) Proces~ for Assigninq Oesiqnated Uses The Tribe is responsible for assigning designated uses to all waters within the reservation boundaries. All reservation surface waters maybe assigned one or more of the beneficial use designations set forth in Section VII (A) . Waters shal~ be designated for present beneficial uses, future beneficial uses for which the water is suitable or uses as reasonably ~xpected goals as described in section III (X) Use Attainability Analysis. When assigning designated uses to waters of a given area, the Tribe will consider the goals, objectives, and requirements of the Federal and Tribal statutes and regulations. (1) Designa~ed uses should be directed towards the realization of the water quality goals as set forth in the Clean Water Act. (2) Designated uses must be protective of water quality for current and future uses consistent with the Tribe's antidegtadation policy. (3) Upstream designated uses must not jeopardize downstream designated uses or actual uses. ';1 ^j <j 10 , .~ -, L;:; ~;: <, ;~''';:!;/., ".:}. -.;; :;;.~.,:;- -:~~ ,:. ';,~; '~'~':~;.J";:~'~:,;;:::,...~>"..: :''.>.-_~ .,,....; ~ i' .' ."'.. .. , ,"".' .', . - -,.. ,~,- . ........., ", ',: .~ - ::r -~~:-:-:::.: ;-;';,;:;:\:-;:-.- ;~.:';:(-.~.~-..