unpaved: 637,003 km (1997)
Waterways: 41,009 km
note: navigable inland channels, exclusive of the Great Lakes
Pipelines: petroleum products 276,000 km; natural gas 331,000 km (1991)
Ports and harbors: Anchorage, Baltimore, Boston, Charleston,
Chicago, Duluth, Hampton Roads, Honolulu, Houston, Jacksonville, Los
Angeles, New Orleans, New York, Philadelphia, Port Canaveral,
Portland (Oregon), Prudhoe Bay, San Francisco, Savannah, Seattle,
Tampa, Toledo
Merchant marine: total: 376 ships (1,000 GRT or over) totaling 10,814,622 GRT/14,416,517 DWT
ships by type: barge carrier 9, bulk 68, cargo 29, chemical tanker 13, combination bulk 3, container 80, liquefied gas 1, multi-functional large-load carrier 3, passenger 9, passenger/cargo 1, petroleum tanker 98, roll on/roll off 49, short-sea passenger 3, specialized tanker 1, vehicle carrier 9 (2000 est.)
Airports: 14,720 (2000 est.)
Airports - with paved runways: total: 5,174
over 3,047 m: 182