Page:United States Statutes at Large Volume 32 Part 1.djvu/345

 FIFTY-SEVENTH CONGRESS. Sess. 1. Ch. 890. 1902. 279 by piers, solid embankments, or otherwise which will result in unduly accelerating the high-water current at the site of the bridge shall not be allowed. Sec. 6. That any corporation, compan, or persons owning, con- ’“"‘°““'*g““°“· trolling, or operating the bridge built under the authority of this Act shall build and maintain at all times, as accessory works 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 guiding of rafts, steamboats, and other watercraft safely under or through said bridge; and if at any time after the construction of the bridge and its accessory works the approaches to draw openings, channe spans, or raft passages in said bridge are found to be dan erous or diiiicult of access by any important class of river traiiic, tge Secretary of War may, upon the recommendation of _ the Chief of Engineers, United States Army, order the corgoration, company, or persons owning, controlling, or operating said bridge to construct, under his directions, and tgddiuvml booms. to maintain such additional. sheer booms, dikes, and other devices as ° ` will obviate the difficulty mentioned, which additional sheer booms, dikcs, and other devices shall be built and maintained at their own. expense by said company or persons; and that said company or persons mgm, em. shall maintain, at their own expense, from sunset to sunrise throughout the season of navigation, such lights and other signals on said bridge as may be required by the Light-House Board for the security of navigation. Sec. 7. That the bridge authorized to be constructed by this Act aS°g§§’,>;u‘;Qg‘ *° shall be located and built under and sub'ect to such regulations for the pp P ` security of navigation on said river as the Secretary of War shall prescribe; and to secure that object said corporation shall submit for his examination a design and drawings of the bridge, piers, approaches, and accessory works, and a map of the location, iving, for a space of at least three miles above and one mile below the proposed location, the topography of the banks of the river and the shore lines at high and low water. This map shall be accompanied by others drawn on the scale of one inch to two hundred feet, giving, for a space of onehalf a mile above the line of the proposed bridge and one—quarter of a mile below, an accurate representation of the bottom of the river, by contour lines two feet apart, determined by accurate soundings, and also showing over the whole width of this part of the river the force and directions of the currents at low water, at high water, and at at least one intermediate stage by triangulated observations on suitable floats. The maps shall also show the location of other brid es in the vicinity, and shall give such information as the Secretary of {l’Var 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. 8. That any bridge constructed under the authority of this Act °“‘“‘*'°‘· °"’· shall be built under the general su rvision of the Secretary of War, and no changes or alterations in plldiis shall be made during construction of said bridge or after its completion unless said changes or alterations conform to the provisions oi) this Act and are authorized by the Secretary of \Var; that such alterations and changes as may be required by the Secretary of War in said bridge so as to preserve free and convenient navi tion shall be made under the direction of the Secretary of \Var, at aileir own expense, by the company or persons owning, controlling, or operating said bridge; that during original construction mlrgglgfj °*°·· °¤ °°*· or in carrying out any authorized changes or repairs of said bridge a navigable channel shall be reserved at the site of the bridge at all times, and the waterway of the river shall not be obstructed to a greater