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The efficient functioning of the Mississippi and its tributaries is supported by the Great Lakes system and numerous other inland waterways, culminating in over 12,000 miles (19,000 kilometers) of commercially navigable routes across the United States. This extensive system demonstrates America's commitment to maintaining and enhancing its transportation infrastructure—a commitment not often seen in other modes of transportation. Unlike railroads and highways, which are predominantly privately managed or state-operated, the U.S. Federal Government takes a direct role in the operational management of inland water systems through the Army Corps of Engineers.