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.0 -"":'l. ~,) .., 15 -.} tv predation from introduced non-native fishes have been cited as the major factors responsible for the .decline of the species. As a top level predator, the Colorado squawfish may experience bioaccumulation of contaminants from its prey. Endemic to the Colorado River basin, the squawfish has historically been found in tne San Juan River and anecdotal reports of the species in the Animas River have also been recorded. Recent collections have yielded a total of 20 young-of-the-year squawflsh in backwaters of the San Juan River or laNai drift collections at various locations downstream of Shiprock, New Mexico. In the summer of 1996 two juvenile Colorado. squawfish (350-450 mm TL) were captured in the lower 12 miles of the San Juan River. Since 1991, 17 adult squawfish have been captured downstream of Shiprock and several others obseNed in the river between the Hogback and Aneth, Utah. The rediscovery of adult Colorado squawfish, presence of several age classes, and documentation of its successful spawning in the San Juan River reconfirmed the species as a viable component of the ichthyofauna of the San Juan River. Critical habitat has been designated for the Colorado squawfish in the San Juan River and its 100-year floodplain from New Mexico State Route 371 Bridge in T.29N., R.13W" section 17 (New Mexico Meridian) to Neskahai Canyon in the San Juan arm of Lake Powell in T.41S., R.11E., section 26 (Salt Lake Meridian) up to the full pool elevation. 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 SeNice Company of New Mexico's San Juan Generating Plant with a net capacity of 1,723 megawatts and the Arizona Public SeNice Company's 2,040-megawatt Four Corners Power Plant).