33 U.S. Code § 34 - Mill Slough, Oregon
Mill Slough, a tidal tributary of Coos Bay, lying within the limits of the city of Marshfield, State of Oregon, is declared to be not a navigable waterway of the United States, within the meaning of the laws enacted by Congress for the preservation and protection of such waterways, and the consent of Congress is given to the filling in of said slough by the said city of Marshfield.
Source(Oct. 23, 1913, ch. 33, 38 Stat. 233.)