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. o o () ':' 15 .... 0) R.11 E., section 26 (Salt Lake Meridian) up to the full pool elevation. The southwestern willow flycatcher was listed by the Fish and Wildlife Service in 1995 in response to documented declines in population size and extent of historic range occupied resulting from loss, modification, and fragmentation of riparian habitat and parasitism by the brown-headed cowbird. The species is known to nest in northern New Mexico, although there are no known breeding flycatchers and no historic records of nesting flycatchers occurring within the San Juan River floodplain within the project area. Hubbard (1987) documented reports of singing flycatchers near Farmington, New Mexico, but it was assumed that they were migrants; thus, the species is not known as a definite summer resident of the San Juan River Valley. However, unsurveyed, suitable habitat exists in scattered disjunct parcels of riparian habitats along the river. Thus, the presence of the species cannot be discounted. E. ARCHEOLOGICAL AND HISTORIC RESOURCES The San Juan Basin contains cultural resources of major significance spanning from the Paleo Indians (10,000-5,000 BC)to the present. No known archeological sites will be impacted by the implementation of the preferred alternative now under analysis. F. LAND USE AND SOCIOECONOMIC RESOURCES The economic base of the general area included in this environmental analysis is primarily derived from agriculture (crop and livestock production) and mining. Until 1950, the area immediately surrounding Farmington, New Mexico, was known primarily for the extensive annual fruit crop (apples, pears, peaches) and for extensive cattle and sheep production. In that year, large-scale oil and natural gas development began in the San Juan Basin. Coal development in the area has been the foundation for the construction of electric generating stations west of Farmington (Public Service Company of New Mexico's San Juan Generating Plant with a net capacity of 1.723 megawatts and the Arizona Public Service Company's 2,040-megawatt Four Corners Power Plant). V. ENVIRONMENTAL CONSEQUENCES A. PREFERRED ALTERNATIVE --IMPLEMENTATION OF AUGMENTATION PLAN The proposed action is considered to pose no impacts to environmental resources in the San Juan River other than aiding in the ultimate recovery of the razorback sucker through the establishment, by 2001, of a multiple year-class population of razorback sucker sub-adults and adults that are largely invulnerable to predation by channel catfish and other predators. Augmenting the population will allow sufficient numbers for natural spawning aggregations to occur at the levels where spawning and recruitment to the population are successful. This will accomplish a major milestone identified in the San Juan Implementation Program for the recovery of the species.