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3. Colorado River Basin a) Colorado River Mainstem There has been a range of modest water supply development activities, including reservoir development, ongoing in the Colorado River mainstem basin. The water rights and augmentation aspects of in -basin water supply needs for Summit and Grand Counties have been largely addressed by the Summit County and the Clinton Gulch Reservoir Agreements and the Green Mountain Reservoir Operating Policy and contracting agreements. Remaining problems in the basin are primarily related to physical flow shortages during critical fall and winter season low flow periods. The Upper Colorado River Basin study has identified remaining needs in the two counties related to in -basin water supply, instream flow deficits and desired recreational reservoir levels along with conceptual solutions for each of these issues. In Summit County, physical shortages in the Snake River basin can be addressed by pumping water from the Montezuma drop shaft of the Roberts Tunnel. Physical shortages in the Blue River basin can be addressed through water rights administration agreements between Denver Water and Colorado Springs. Physical shortages in the Ten Mile Creek basin can be addressed through additional acquisition and redevelopment of water rights and facilities related to the Climax Mine. In Grand County, physical shortages 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. Related to the CBT system, Windy Gap participants are investigating reservoir options for firming the yield of the Windy Gap project. One of the options being considered is a proposed off - stream Jasper North Reservoir, which would be located north of Willow Creek between Willow Creek Reservoir and Granby Reservoir. In -basin water users in Eagle County are actively planning to address their future water supply and instream flow needs through a combination of small scale upper system reservoir development, consolidation of water supply systems and purchase of augmentation supplies from Green Mountain Reservoir. Any remaining in -basin supply needs are likely to be addressed through development of a cooperative project with the City of Aurora and the Climax Mine, which has been the principal focus of the Eagle River Assembly (an ad hoc group of water interests from the Eagle River Valley and the cities of Aurora and Colorado Springs). Other water development activities in the Colorado River mainstem basin have been primarily focused on augmenting the flow of the Colorado River through the 15 -mile reach of critical habitat for endangered fish species near Grand Junction. 39