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3 Other proposed modifications are listed below: Amendment of the Denver/CRWCD Lease Agreement, resulting in the Denver Water Board owning 40 percent of the Wolford Mountain Project subsequent to the 25-year period of lease payments, which will expire in January 2020. Water Court Case 91CW252, with stipulations, which limits the timing and manner in which Denver may use the Wolford Mountain-to-Green Mountain Substitution with an ultimate limitation of 160,000 acre-feet over any running 30 year period, and a sharing of the substitution with Williams Fork Reservoir. Adoption on December 1, 1995. of a Marketing Policy by the Board of the Colorado River Water Projects Enterprise of the CRWCD providing for the utilization of the West Slope component of the reservoir. The evaporative losses from the reservoir changed from 800 to 1000 acre-feet, to 2000 acre-feet in the modification proposal. An additional 10,000 acre-feet will be marketed to western slope users, probably to municipalities that will use the water for augmentation plans. The maximum pool elevation would increase from 7,485 feet msl to 7,489 feet msl, and the surface acreage would increase from 1,450 acres to 1,550 acres. The average annual depletion will increase from 7,716 acre-feet per year to 13,485 acre-feet. BASIS FOR BIOLOGICAL OPINION This biological opinion addresses an average annual depletion of approximately 13,485 acre-feet from the Upper Colorado River Basin. Water depletions in the Upper Basin have been recognized as a major source of impact to endangered fish species. Continued water withdrawal has restricted the ability of the Colorado River system to produce flow conditions required by various life stages of the fishes. Critical habitat has been designated for the Colorado squawfish, humpback chub, bony tail , and razorback sucker within the 100-year floodplain in portions of their historic range (59 F.R. 13374). Destruction or adverse