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amount of traffic passing over this bridge is about 25 times as much as that which floats on the water beneath it, and is far higher in quality and value per ton.

The other railroad bridge crossing the river within the city limits is the Thirty-third Street viaduct of the Baltimore and Ohio Railroad. This is a link in the Baltimore and Ohio Railroad between the East and the West and carries an enormous traffic amounting each year to about 217,000 passengers and 24,330,000 tons of freight, express and other trains.

Uniting this with the traffic over the Fort Wayne bridge of the Pennsylvania we have crossing the Allegheny River on the two railroad bridges a gross amount of 77,330,000 tons, and 5,102,000 passengers and pedestrians, with a value of tonnage traffic estimated at approximately $4,957,000,000.

APPENDIX II

Amount and Importance of River Traffic. -- The following statistics were obtained from the United States Engineers' office and show the number of boats, net tonnage and number of passengers passing Dam No. 1 in the Allegheny River during the year 1909:

TABLE No. 1

Month	No. vessels	No. passengers	Tonnage of cargoes
January	338	16	30,889
February	358	18	30,073
March	1,055	25	81,424
April	732	197	51,457
May	896	1,506	57,269
June	958	1,248	56,324
July	901	2,495	37,888
September	1,006	1,681	36,759
October	955	982	53,622
November	789	616	42,827
December	495	231	29,086
Total	9,351	11,034	536,720

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Last modified on 22-Dec 1999
Design format: copyright 1997-1999 Bruce S. Cridlebaugh
Original document: Frederick Law Olmsted, 1910