556 FIFTY-FIRST CONGRESS. Sess. I. Ch. 1131. 1890, • at said spanfor spans; norhshglldthere be any unnecessary delay in the P•¤¤¢•= ¤‘°·*¤¤ assa e o trains over the ri es. ,¤<>¤=¢¤‘¤<=¤i<>¤ lg P Sncgl 4. That all piers shall die built parallel with the current of ’ £{°’°°°°s”°"w°rthe river at that stage of water which is most important for navigation; and the bridges themselves shall be built as nearly as may be ommmm ¤¤¤¤v· at right angles thereto; and that riprapping or other protection for ""**°“ imperfect foundations which will lessen the required water-way 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 above-mentioned effects, or if any riprapping or other protection prohibited by this section is found to exist, the nuisance s all be abated or corrected under the direction of the Secretary of War, and at the expenlsi og the company or persons owning, controlling, ' or o rating said ri ges. Am>r¤¤<>h¤¤- S1; 5. That the approaches to said bridges shall be so designed , and constructed as not to interfere with the free discharge of said , _1mm»um¤m¤ by river in seasons of flood- and any encroachment on the high·water "°”· °°°‘ cross-section by piers, solid embankments, or otherwise which will rgsuét iii; undhay accegaragng 6g1e high-water current at the site of t e ri s s not a ow . - Aidstenavisntion- Sec. 6$6That any corporation. com any, or persons owning, controlling, or olperating the bridges built under the authority of this act shall bui d and maintain at all times, as accessory works to such bridges, such booms, piers, dikes, rd·fences, and similar devices as may be necessary to insure at all times a permanent channel for a sunicient distance above and below the bridge sites, and for the guiding of rafts, steam-boats, and other water-craft safely under or M¤i¤¤¤•\•¤¤ throng said bridges; and if at anlystime after the construction of the bridges and their accessory wor the approaches to draw-openings, channelspans, or raft passages in said l ridges are found to be dangerous or difficult of access by any important class of river traiiic ' the Secretary of War may, upon the recommendation of the Chief of Engineers, United States Army, order the corlporation, company, or (persons owning, controlling, or operating said ridges to construct un er his directions and to maintain such additional sheer-booms, dikes, and other devices as will obviate the diiiiculty mentioned, which additional sheer-booms, dikes, and other devices shall be built and maintained at their own expense by said company or persons; and that said company or persons shall maintain at their own expense, from sunset to sunrise throughout the season of navigation, Haw. wv- such lights and other si als on said bridges as may be required by the Light-House Board fdr the security of navigation. ujjcmtr <>f New Sec. 7. That the bridges authorized to be constructed by this act `Ofwnw gall be lopatectl and bné t uncger anld subgect tqlfucéh regulatiqngwfor “°°"°*·“’{ e securi o navi a ion o said rivers as e ecre a o ar
°°°"°¤' shall prescilibe; and 5) secure that object said corporationrgrhall submit for his examination a desi n and drawings of the bridges, piers,
approaches, and accessory worhs, and a map of each location, giving, for a space of at least three miles above an one mile below the proposed ocations, the to ography of the banks of the rivers and the Mmm shore-lines at high andllow water. These maps shall be accompanied by others, drawn on the scale of one inch to two hundred feet, giving, for a space of one-half a mile above the line of the proposed bridgles and one-quarter of a mile below, an accurate representation of the bottoms of the rivers, b contour lines two feet apart, determined by accurate soundings. andy also showing over the whole width of this part of the rivers the force and directions of the currents at low water, at high water, and at least one intermediate stage, by triangulated observations on suitable floats. The maps shal also show the location of other bridges in the vicinity, and shall give such information as the Secretary of War may require for a full and satis-
