Table 1-1: System Mileage Within the United States

(Statute miles)

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KEY: N = data do not exist; R = revised; U = data are not available.

^a All public road and street mileage in the 50 states and the District of Columbia. For years prior to 1980, some miles of nonpublic roadways are included. No consistent data on private road mileage are available. Beginning in 1998, approximately 43,000 miles of Bureau of Land Management Roads are excluded.

^b Data represent miles of road owned (aggregate length of road, excluding yard tracks, sidings, and parallel lines).

^c Portions of Class I freight railroads, Amtrak, and commuter rail networks share common trackage. Amtrak data represent miles of road operated.

^d Transit system mileage is measured in directional route-miles. A directional route-mile is the mileage in each direction over which public transportation vehicles travel while in revenue service. Directional route-miles are computed with regard to direction of service, but without regard to the number of traffic lanes or rail tracks existing in the right-of-way.

^e These are estimated sums of all domestic waterways which include rivers, bays, channels, and the inner route of the Southeast Alaskan Islands, but does not include the Great Lakes or deep ocean traffic. The Waterborne Commerce Statistics Center monitored 12,612 miles as commercially significant inland shallow-draft waterways in 2001.

^f Includes trunk and gathering lines for crude-oil pipeline.

^g Excludes service pipelines. Data not adjusted to common diameter equivalent. Mileage as of the end of each year. Includes gathering, transmission, and distribution mains. Prior to 1990 data also include field lines. See table 1-10 for a more detailed breakout of oil and gas pipeline mileage. In the past, mileage data reported in Gas Facts was taken from the American Gas Association's member survey, the Uniform Statistical Report, supplemented with estimates for companies that did not participate. For 2002 and revised data back to 1990, Gas Facts mileage data is now based on information reported to the U.S. Department of Transportation on Form 7100.

SOURCES

Highway:

1960-95: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995, FHWA-PL-97-009 (Washington, DC: Annual issues), table HM-212.

1996-2003: Ibid., Highway Statistics (Washington, DC: Annual issues), table HM-20.

Class I rail:

1960-2003: Association of American Railroads, Railroad Facts 2004 (Washington, DC: 2004), p. 45, and similar tables in earlier editions.

Amtrak:

1980: Amtrak, Corporate Planning and Development, personal communication (Washington, DC).

1985-2001: Amtrak, Corporate Planning and Development, Amtrak Annual Report, Statistical Appendix (Washington, DC: Annual issues).

2002-03: Association of American Railroads, Railroad Facts 2004 (Washington, DC: 2004), p. 77, and similar tables in earlier editions.

Transit:

1985-2002: U.S. Department of Transportation, Federal Transit Administration, National Transit Database (Washington, DC: Annual issues), table 23 and similar tables in earlier editions.

Navigable channels:

1960-96: U.S. Army Corps of Engineers, Ohio River Division, Huntington District, Ohio River Navigation System Report, 1996, Commerce on the Ohio River and its Tributaries (Fort Belvoir, VA: 1996), p. 2.

1997-99: Ibid., Waterborne Commerce Statistics Center Databases, personal communication, Aug. 3, 2001.

2000-03: Ibid., personal communication, Aug. 12, 2003 and July 23, 2004.

Oil pipeline:

1960-2000: Eno Transportation Foundation, Inc., Transportation in America, 2002 (Washington, DC: 2002), p. 58.

2001-03: U.S. Department of Transportation, Research and Special Programs Administration, Office of Pipeline Safety, Pipeline Statistics, Internet site http://ops.dot.gov/stats.htm as of Dec. 8, 2004.

Gas pipeline:

1960-2002: American Gas Association, Gas Facts (Arlington, VA: Annual issues), tables 5-1 and 5-3 and similar tables in earlier editions.