Oklahoma had 5,195 km (3,228 mi) of railroad track in 2004. Clinton, El Reno, Enid, Oklahoma City, McAlester, Tulsa, Holdenville, Durant, and Muskogee are important railroad centers. The primary commodities originating in the state and transported by rail are nonmetallic minerals (50 percent of total freight), chemicals (11 percent), petroleum products (7 percent), and farm products (11 percent).
In 2007 Oklahoma was served by 181,730 km (112,922 mi) of highways. Of those, 1,502 km (933 mi) were part of the federal interstate highway system. Interstates 40 and 44 are the principal east-west routes; Interstate 35 bisects Oklahoma going north to south.
The state has 4 airports, most of which are privately owned. The two commercial airports handling the most passengers are at Oklahoma City and Tulsa, although neither are busy by national standards. Scheduled air service also goes into Lawton, Guymon, Muskogee, Ponca City, and Bartlesville.The McClellan-Kerr Arkansas River Navigation System was dedicated in 1971. The system connects Tulsa with the Mississippi River. Pipelines, used to transport petroleum and natural gas, crisscross the state underground. Cushing is a major pipeline center of the Southwest.
There are many large dams to utilize the water of the Arkansas and Red river systems as a source of energy for electricity.
Among Oklahoma’s largest hydroelectric dams are Tenkiller Dam on the Illinois River, Denison Dam on the Red River, Keystone Dam on the Arkansas River, and Pensacola Dam on the Grand River. Most hydroelectric dams have been built since the 1940s.
In central and western Oklahoma, the drier parts of the state, most power is generated by steam plants using coal or gas. The water supply in the lakes is not dependable enough for the generation of hydroelectric power. The large western lakes serve as sources of water supply for cities, for irrigation, and for recreation.
In the state as a whole, 96 percent of electricity is generated in plants burning coal or natural gas, and the remainder comes from hydroelectric facilities. "Oklahoma" © Emmanuel BUCHOT, Encarta, Wikipedia
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