Federal law prohibits the construction or modification of any bridge across navigable waters of the United States unless first authorized by the Coast Guard. The Coast Guard approves the location, plans and navigational clearances of bridges through the issuance of bridge permits or bridge permit amendments.
Construction of bridges or causeways over or in any navigable river or other navigable water, and international bridges regardless of the waterway's navigability.
Statute or Regulations:
Section 9, Rivers and Harbors Appropriations Act of 1899, as amended (33 USC 401); the Act of March 23, 1906, amended (33 USC 491), the General Bridge Act of 1946, amended (33 USC 525); the International Bridge Act of 1972 (33 USC 535)