F1l·"1`Y—NlN TH CONGRESS. Sess. 1. Ch. 2. 1905. 3 one draw opening of three hundred feet may be substituted if, in the opinion of the Secretary of War, the interests of navigation be not injured thereby. · Sec. 3. That all draw spans authorized by this Act shall be operated 0F""'i“¥ dm'- by steam or other reliable mechanical power, and shall be opened promptly upon reasonable signal for the passage of boats, except when trains are passing over said span or spans; but in no case shall unnecessary delay occur in opening said draw after the passage of trains, and also that in case the opening of a draw is delayed by reason of the passing of a train after the signal has been given from a boat ready to pass through, the draw shall be opened for the passage of such boat before another train is allowed to ass over the said span or spans; nor shall there be any unnecessary delay in the passage of trains over the bridge. Sec. 4. That.all piers shall be built parallel with the current of the p,é’,‘;’},Qj'“°‘*°” °* river at that stage of water which is most important for navigation, ’ ` and the bridge itself shall be built as nearly as may be at right angles thereto; and that riprapping or other protection for imperfect foundations which will lessen the required waterway shall not be permitted; and also that 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 abovementioned eifects, or if any riprap ing 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 comparriy or persons owning, controlling, or operating saidbridge. Sec. 5. hat the approaches to said bridge shall be so designed and A”’°°°*‘°"· constructed as not to interfere with the free discharge of said river in. seasons of Hood; and any encroachment on the high—water cross section 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, company, or persons owning, con- *l““'°“"'¥°“°"· trolling, or operating the bridge built under the authority of t is 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 water craft 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, channel spans, or raft passages in said bridge are found to be dangerous or ditheult of access by any important class of river trathe, the SecretaIr)y of War may, upon the recommendation of the Chief of Engineers, nited States Army, order the corporation, company, or (persons owning, controlling, or operating said brid e to construct, un er his directions, and to maintain suc additionafl sheer booms, dikes, and other devices as will obviate the ditliculty mentioned, which additional sheer booms, dikes, and other devices shall be built and maintained at their own expense by said com- _ pany or persons; and that said company or persons shall maintain, at L"-‘“"·°*°· their own expense, from sunset to sunrise throughout the season of navigation such lights and other signals on said bridge as may be re uired b the Light-House Board for the security of navigation. {Sec. 7. That the bridge authorized to be constructed by this Act ,p$,°,$,'$£QlV,§f “’ shall be located and built under and subject to such regulations for the 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, giving 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
