| http://www.w3.org/ns/prov#value | - The act provided for the alteration of existing bridges which interfered with free navigation (sections 4 and 5); prohibited the dumping of waste material in such waters so as to obstruct navigation (section 6); made it unlawful to build wharves, piers, and other structures named, without the permission of the Secretary of War, in such manner as to obstruct or impair navigation; or to commence the
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