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TABLE 4-2 KNOWN REACHES OF CONCERN ' River Reach Reason Colorado Black Rocks (RM 135-136)(1) Humpback spawning area , Possible bonytail habitat Westwater (RM 116-124) Humpback habitat Green Gray Canyon/Three Fords Squawfish spawning area (RM 148-160) Humpback habitat Possible bonytail habitat Yampa (RM 0-56) Squawfish spawning area Humpback habitat and spawning area Possible bonytail habitat White (RM 0-21) Squawfish high concentration area (1) RM denotes river mile c. Currently, there is uncertainty as to what extent depletions occurring in or near occupied habitat may adversely affect habitat quantity or quality and thus affect endangered species. If the Service determines 1 through consultation that one project or a set of projects will result in impacts that will seriously affect the s pecies, the Service will so report to the project proponent, lead agency, and Implementation ' Committee. The Service and Implementation Committee will identify measures, including the purchase of water through the recovery process, that must be taken to offset these impacts, and these measures will be given immediate attention. 4.1.6. Federal Reservoirs The water resource development projects constructed in the upper basin by Reclamation may have significantly and adversely affected the river system's rare fish species. In addition to the mechanism described in the preceding sections, there are ways to support essential habitat areas through the refined operation of these reservoirs to reduce or eliminate those adverse impacts and contribute to recovery in a manner consistent with all applicable laws. Reclamation is consulting with the Service pursuant to Section 7 of the Endangered Species Act on the impacts of all its projects, including the projects discussed below. Though the final alternatives for these projects will be determined through Section 7, it is anticipated that the biological opinions will recommend alternatives consistent with those discussed below. Appropriate NEPA compliance will be required. 4.1.6.1. Ruedi Reservoir , The Bureau of Reclamation constructed and operates the Green Mountain Reservoir on the Blue River and the Ruedi Reservoir on the Fryingpan River. They have consulted with the Service under Section 7 of the Endangered Species Act to assess impacts of sales of water from these reservoirs on occupied fish habitat downstream. To compensate for depletions associated with these 4-8