Original Bay Bridge
Total project length (bridge and approaches): 8.4 miles
Cost to build original bridge: $77 million in 1936 (including Transbay Transit Terminal)
Height of towers on West Span: 519 feet
Size of tunnel on Yerba Buena Island: 76-feet wide, 58-feet high (largest bore tunnel in the world).
Depth of deepest pier on existing East Span – 242 feet (170 feet mud; 70 feet water). This was the deepest pier of its time!
Number of tons of wire 18,500
Amount of concrete: 1 million cubic yards
Amount of paint: 200,000 gallons

New East Span
200 million pounds of structural steel
5,000 miles of half-inch steel strands in the tension cables
450,000 cubic yards of concrete
Weight of the heaviest Skyway section: 780 tons
Height of tower on new Self-Anchored Suspension (SAS) span: 525 ft.
Largest lift in Caltrans history: 1,700-ton steel girder connecting the Skyway to the SAS spans on the new East Span
Expected lifespan: 150 years

Other Facts
Daily average number of vehicles that use the Bay Bridge: 280,000
Daily average number of vehicles that use the Brooklyn Bridge:137,500

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