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33 U.S.C. 512: Obstruction of navigationText contains those laws in effect through Public Law 119-120 (October 7, 2026).
From Title 33-NAVIGATION AND NAVIGABLE WATERSCHAPTER 11-BRIDGES OVER NAVIGABLE WATERS
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§512. Obstruction of navigation

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

( June 21, 1940, ch. 409, § 2 , 54 Stat. 498 .)