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more of the constituent elements are considered critical habitat. Areas within the 100- year floodplain which have been previously developed are not likely to provide constituent elements when flooded. Paved areas, road and rail corridors, built-up areas within municipalities, and other previously developed or farmed areas are not considered critical habitat. Diked and leveed areas to which a connection to the river remains may continue to provide the constituent elements necessary for inclusion as critical habitat. Similarly, abandoned sand and gravel pits may provide the constituent elements of critical habitat. Sand and gravel operations which are currently extracting materials are not considered critical habitat. However, the site of such operations may later provide opportunities to recover these species. As previously mentioned, although private land may be designated, regulation of activities only takes place when there is Federal involvement. Critical habitat designation applies only to those projects or activities which require Federal involvement (i.e.. funding, permits etc.) in order to proceed. Several reservoirs or portions thereof are included in the critical habitat designation. This designation is for all lands contained within the reservoir shorelines at the full-pool elevation. The full-pool elevation is defined as the water surface elevation at full capacity. The reservoirs physical features such as gravel bars, shallow depressions, washes, and areas of riparian vegetation that when covered by water, can provide spawning, nursery, feeding or other habitat components, can provide critical habitat. By establishing the upper boundary at the full pool elevation, all possible physical habitats within the reservoir are included as critical habitat regardless of the water elevation at any given time. The critical habitat designation does not require the reservoir to be continuously maintained at the full pool elevation. Changes in water surface elevations due to reservoir operations may have effects to the listed species or the critical habitat, however, these effects would be considered during project specific Section 7 consultations. RAZORBACK SUCKER The Service is proposing 15 reaches of the Colorado River system (Figure 6 and Table 2) for designation as critical habitat for the razorback sucker. In the Upper Basin, critical habitat is being proposed in the Green, Yampa, Duchesne, White, Colorado, Gunnison, and San Juan rivers in the Lower Basin. Portions of the Colorado, Gila, Salt, and Verde rivers are being proposed. Fifty-two percent (1,824) of the historical range of razorback sucker is proposed for designation as critical habitat. This represents reaches in each of the major basins of its historic range. Other areas that are not proposed also may be important and may contribute to the eventual recovery of razorback sucker. 41