No bridge shall at any time unreasonably obstruct the free navigation of any navigable waters of the United States.

Terms Used In 33 USC 512

  • bridge: means a lawful bridge over navigable waters of the United States, including approaches, fenders, and appurtenances thereto, which is used and operated for the purpose of carrying railroad traffic, or both railroad and highway traffic, or if a State, county, municipality, or other political subdivision is the owner or joint owner thereof, which is used and operated for the purpose of carrying highway traffic. See 33 USC 511
  • United States: when used in a geographical sense, includes the Territories and possessions of the United States. See 33 USC 511