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seem to have the fewest adverse impacts. Seaman Reservoir enlargement would likely encounter problems with the endangered Preble's mouse, as would Glade Park, which would also require the relocation of U.S. Highway 287. Most of the pipeline projects being proposed in the Northern region are conceptually valid mechanisms for better integrating the operations of existing water supply systems. While most of these structural projects have some merit, their ultimate implementation will be continually tempered by the ever - present alternative of acquiring irrigation supplies, many of which include already- developed storage and provide substantial "up- front' yield without building additional storage. As noted above, continued transfer of irrigation water to M &I uses should be done in an orderly and sensitive manner. 5. Colorado River Basin a) Upper Colorado River Mainstem and Fraser River In the Upper Colorado River basin, most of the growth in water demand is expected to occur in the Fraser River basin and in areas around Grand Lake. Water supply augmentation sources for water users in Grand County include Clinton Gulch Reservoir, Green Mountain Reservoir, Muddy Creek Reservoir and Windy Gap exchange water. Remaining water supply problems in the basin are primarily related to physical flow shortages during critical fall and winter season low flow periods in the Upper Fraser River basin and low flows on the Colorado mainstem below Windy Gap. Physical shortages in the Fraser River basin can be addressed by Grand County participation in Denver's North End project, which would allow Denver to increase water deliveries from its Moffat Tunnel collection system to the Fraser River basin without loss of yield to its system. The Town of Kremmling is addressing its water supply problems by developing its conditional water rights for diverting water directly from the Colorado River. b) Blue River Basin In the Blue River Basin, the largest growth in water demands is expected to occur in population centers associated with the Summit County ski areas and in communities around Dillon Reservoir. Most of these communities have water rights and augmentation plans that are sufficient to meet projected build -out. However, potential shortages have been identified for several areas in the Snake River, Upper Blue River and Tenmile Creek drainages, primarily during the fall and winter months, due to insufficient physical supply. In the Snake River basin, it is possible to meet most of the shortfall by pumping water from the Montezuma drop shaft of the Roberts Tunnel. Water rights administration agreements between Denver Water and Colorado Springs be able to address the physical shortages in the Upper Blue River basin. Additional acquisition and redevelopment of water rights and facilities related to the Climax Mine can address physical shortages in the Ten Mile Creek basin. None of these cooperative projects requires significant construction outlays. 47