FIFTY-EIGHTH CONGRESS. Sess. H. Cu, 170. 1904. 55 as may be at right angles thereto; and riprapping or other protection for imperfect foundations which will lessenthe required waterway shall not be permitted; and piers which will produce cross currents or bars dangerous to navigation shall not be constructed; and if, after construction, any piers or accessory works are found to produce the above-mentioned effects, or if any riprapping or other protection prohibited by this section is found to exist, the nuisance shall be abated or corrected under the direction of the Secretary of War at the expense of the company or persons owning, controlling, or operating said bridge. . Sec. 4. That the approaches to said bridge shall be so desi ned and Al’*"°“°h°*· constructed as not to interfere with the free discharge of san? river in seasons of iiood; and any encroachment on the high-water cross section by piers, solid embankments, or otherwise which will unduly apfzeleréite the high—water current at the site of the bridge shall not be a owe . Sec. 5. That the corporation, company, or persons owning, control- Aid¤°°¤¤'i8¤*i°¤· ling, or operating the bridge built under the authority of this Act shall build and maintain at all times as accessory work to such bridge such booms, piers, dikes, guard fences, and similar devices as may be necessary to insure at all times a permanent channel for a sufficient distance above and below the bridge site and for the uiding of rafts, steamboats, and other craft safely under or through said bridge; and if at any time after the construction of the bridge and its accessory works the a proaches to draw openings, channel s ns, or raft passages insaid bridge are found to be dangerous or didcult of access by river trathethe Secretary of War may, upon the recommendation of the Chief of Engineers, United States Army, order the corporation, company, or persons owning, controlling, or operatin said bridge to construct, under his direction, and to maintain such additional sheer booms, dikes, and other devices as will obviate the difiiculty mentioned, which additional sheer booms, dikes, and other devices shall be built and maintained at their own expense by said company or persons, and said company or persons shall maintain, at their own ex use, from sunset to sunrise, such lights and other signals .on said lbiidge as may be mgm, em. re uired b the Light-House Board. Sec. 6. That the bridge authorized to be constructed by this Act aS°r$)’$;°;{;g; $**0 shall be located and built under and subkact to such regulations for the pp` security of navigation on said river as the Secretary of War shall pre- · scribe; and to secure that object said corporation shall submit for his examination a design and drawing of the bridge, piers, approaches, and accessory works, and a map of the location, giving for a space of one mile above and one mile below the proposed location the topography of the banks of the river, the shore lines at high and low water, the force and direction of the currents, the location of other brigges in the vicinity, and such further information as the Secretary of ar may require for a full and satisfactory understanding of the subject; and the construction of the proposed bridge shall not be commenced until the location and plans thereof are approved by the Secretary of lVar. Sec. T. That any bridge constructed under the authority of this Act C**'*“$°* shall be built under the general supervision of the Secretary of lVar, and no changes or alterations in plans shall be made during the construction of said bridge or after its completion unless said changes or alterations are authorized by the Secretary of lVar. That such alterations and changes as may be required by the Secretary of War m said bridge before or after completion, so as to preserve free and convenient navigation, shall be made under the direction of the Secretary of lVar, at the expense of the company or persons OWD1Dg,·CODtTQll1Dg, or operating said bridge. That during original construction or in carry- ing out any authorized changes or repairs of said bridge a navigab e
