PART V: Special Reports
The City and The Allegheny River Bridges
Pittsburgh: Main Thoroughfares and The Down Town District
Frederick Law Olmsted report to The Pittsburgh Civic Commission, 1910
page 138
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people in reaching their offices or an hour's delay beyond the expected time in the delivering of household food supplies or express packages, etc., for a number of families, is a much more serious matter than a corresponding or even a greater delay in the delivery of a barge-load of gravel or coal, even though the barge-load were of equal value with the delayed lot of supplies.
Details in regard to the volume of traffic over the bridges and estimates of the value of the goods transported and the equipment engaged in the traffic are given in Appendix I and are summarized in graphical form in Diagrams 1, 2 and 3. The amount and importance of bridge traffic may be summarized by stating that there passes over the existing Allegheny River bridges each year about 108,000,000 tons of traffic roughly valued at $9,350,000,000; and about 62,700,000 human beings, passengers and pedestrians.
Comparative Diagram showing total tonnage over and under the Allegheny River bridges.
(b) River Traffic. -- The data in regard to existing navigation under the Allegheny bridges consist of detailed reports of vessels and cargoes passing Dam No. 1 and counts of the number of vessels passing under the several bridges during representative
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