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Pecos(pā`kəs), city (1990 pop. 12,069), seat of Reeves co., W Tex., on the Pecos River; inc. 1903. It is a railroad and highway junction and the market for an extensive ranch and irrigated farm area; water is supplied by the Red Bluff Dam on the Pecos. It is also a sand and gravel and gas and oil center. There are cattle feed lots. The annual rodeo, held there since 1883, was the world's first.
Pecos,river, 926 mi (1,480 km) long, rising in N N.Mex. near the Truchas peaks and flowing SE across E N.Mex. and W Tex. to the Rio Grande; drains c.38,300 sq mi (99,200 sq km). In New Mexico, dams at Alamogordo, Avalon, and McMillan serve the Carlsbad reclamation project (est. 1906), which irrigates c.25,000 acres (10,120 hectares); in W Texas, Red Bluff Dam forms a reservoir on the Pecos. Long-standing interstate disputes about water use were settled in 1949, when a federal bill provided for a compact between New Mexico and Texas. In the heyday of ranching in W Texas, "west of the Pecos" was the term for the distinct and rugged region of the western tip of the state.
a river in the southwestern USA, a left tributary of the Rio Grande. The Pecos rises in the Rocky Mountains on the slopes of the Sangre de Cristo Range. It is 1,215 km long and drains an area of 101,000 sq km. It crosses the Llano Estacado Plain in a deep valley and is fed by rain and groundwater. In the lower course, the mean annual flow rate, as a result of the withdrawal of water for irrigation, is only 8 cu m per sec; the maximum flow rate is more than 3,000 cu m per sec. Large reservoirs include the Alamogordo, McMillan, and Red Bluff. The city of Carlsbad is on the Pecos.