33 U.S.C. § 666 - U.S. Code - Unannotated Title 33. Navigation and Navigable Waters § 666. Noting conditions of navigable channels

The said commission shall from time to time note the conditions of the navigable channels of said river systems, by cross-section surveys or otherwise, in order to ascertain the effect therein of such hydraulic mining operations as may be permitted by its orders and such as is caused by erosion, natural or otherwise.