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I I I I I I I I I I I I I I I I I I I 000120 No Action Alternative Under this alternative the Rule would not be implemented and there would not be an action that would trigger coordination under the FWCA. However, it is possible that California and Nevada could enter into a SIRA to provide for off stream storage and development and release ofICUA without the Rule, Appropriate coordination with the Service would be carried out to comply with the act on a case-by-case basis. 3, Rioarian Habitat Preferred and No Action Alternatives Reclamation has considered the potential for impacts on the riparian habitat located along the Colorado River. The movement of water under the Rule falls within the current and projected routine operational criteria for the LCR and is consistent with the BCP A and the Decree. Reclamation modeled the effects, for most likely and low probability scenarios, of storage of Colorado River water and development and release ofICUA on water surface elevations in reservoirs and river reaches, Under the Preferred Alternative, the off stream storage of Colorado River water and release ofICUA under the Rule would result in very small increases or decreases in water surface elevations, These very small changes will not cause significant impacts on riparian and marsh habitats in the LCR (see BA for discussion), This conclusion includes potential impacts to Indian trust assets along the Colorado River. Riparian vegetation on the Colorado River mainstream is most prevalent in the T opock Marsh area above Lake Havasu and downstream from Parker Dam for approximately 185 miles to the southerly international boundary with Mexico, With the preferred alternative, a SIRA between authorized entities in the Lower Division States would not change the volume of water delivered downstream of Parker Dam, The Topock reach above Lake Havasu would continue to be affected by similar flows under the No Action Alternative because diversions to either California or Arizona would continue to be made at either the CAP aqueduct system or the MWD aqueduct system from Lake Havasu, As mentioned earlier in the description of operations these two systems are located within a short distance of each other and draw from the same sOUl'ce. Riparian and marsh vegetation around Lakes Mead, Mohave, and Havasu is extremely restricted because of the desert terrain that extends directly to the water's edge, In addition, operations of Lakes Mohave and Havasu will not change with implementation of the Preferred Alternative or under the No Action Alternative. Very small fluctuations in water surface elevations in Lake Mead and riverine reaches of the LCR mainstream will not result in significant impacts on riparian and marsh vegetation from operations under the Rule, 20