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Waterway mileages were determined by including the length of channels 1) with a controlling draft of nine feet or greater, 2) with a commercial cargo traffic reported for 1998 and 1999, but 3) were not offshore (i.e., channels in coastal areas included only the miles from the entrance channel inward). Channels within major bays are included (e.g., Chesapeake Bay, San Francisco Bay, Puget Sound, Long Island Sound, and major sounds and straits in southeastern Alaska). Channels in the Great Lakes are not included, but waterways connecting lakes and the St. Lawrence Seaway inside the United States are included. Approximately 4,300 miles are counted twice as several waterways are state boundaries.
* Includes only the 39 states and the Distric of Columbia with inland waterways.