Section text and notes
July 25, 1912, ch. 253, § 1 37 Stat. 222 July 3, 1930, ch. 847, § 3 46 Stat. 946 Oct. 17, 1940, ch. 895, § 3 54 Stat. 1200 section 603a of this titleSection, acts , ; , ; , , related to removal of temporary obstructions and to minor improvements in navigable waters. See .