9c: FIFTIETH CONGRESS. Sess. II. Ch. 407. 1859. point and with spans giving a clear width of water-way of not less than two hundred feet 0n each side of the central or pivot pier of the draw, and the next adjoining span or spans to the draw shall give a clear width of water-way of not less than threehundred and Pivot pier, em. fifty feet: Provided, That if the pivot pier of said bridge shall be constructed within less than four hundred and ten feet of the west shore of said river the span constructed west of Said pivot pier may be less than three hundred and fifty feet, and every part of the superstructure of said low bridge shall give a clear head-room of not less than ten feet above extreme high—water mark; and the piers of said bridge shall be parallel with the current of the river where said bridge Opening aww. shall be erected: And provided, also, That said draw shall be opened promptly upon reasonable signal for the passage of boats; And proronmu mage. vided further, That if any bridge built under the provisions of this act shall be constructed as a ponton bridge, it shal be built subject, except as herein modified, to all the terms, requirements, and limitations contained in the act entitled "An act to legalize and establish voi is, p. 62. a onton rail-way bridge across the Mississkppi River at Prairie du Chien, and to authorize the construction o a similar bridge at or i near Clinton, Iowa," approved June sixth, eighteen hundred and sevent -four, so far as they may be applicable thereto: And provided, Dmw- also, That it shall be constructed with one suitable ponton draw of not less than five hundred feet in width, located over the main channel of the river, which shall be opened promptly upon reasonable _ siggal for the passage of boats and as herein provided for a drawbri ge. Lswrmamcumwu Sec. 3. That an bridge constructed under this act and according p°S"°“"" to its limitations shall be a lawful structure, and shall be known as a post—route, and the same is hereby declared to be a post-route, upon which also no hi her charge shall be made for the transmission over the same of the maids, the troops, and the munitions of war of the United States, than the rate per mile paid for their transportation over the railroads and public highways leading to said bridge; and equal privileges in the use of said bridge shall be granted all railroad, telephone and telegraph companies, and the United States shall have the rosm telegraph. right of way across Said bridge and its approaches for ‘postal-telegraph purposes. ’ use by mm- com- Sec. 4. That all railroad and other companies desiring to use said ¥’“°‘°"· bridge shall have and be entitled to equal rihts and privileges in the passage of the same, and in the use of the machinery and fixtures m-ms. thereof, and of all the approaches thereto, under and upon such terms and conditions as shall be (prescribed by the Secretary of War, u on hearing the allegations an proofs of the parties, in case they shall 110 agree. mmmm warm Sec. 5. That the structure herein authorized shall be built and "P*"°"°*’ ·°°°· located under and subject to such regulations for the securit r of the navigation of said river as the Secretary of War shall prescribe; and to secure that object the said company or corporation shall submit to the Secretary of War, for his examination and approval, a desi n and drawing of the bridge and a ma of the location, giving for the space of one mile above and one miie below the proposed location, t e topography of the banks of the river, the sl1ore—line at high and low water, t 18 direction and strength of the current at all sta es, and the soundings, accurately showing the bed of the stream, the location of any bridge or bridges, and shall furnish such other information as shall be required for a full and satisfactory understanding of the subject; and until the said plan and location of the bridge are decided by the Secretary of War to be such as will not materially or unnecessarily adect the interests of navigation, the brid e shall not be commenced or built; and should any change be made in the plan of said bridge during the progress of construction,
