Mackinac Bridge

Details:

State:
City:
Condition:
VG
Type:
Linen
Stamp:
3c
Postmark/Cancel:
1960
Size:
3.5" x 5.5" (9 x 14 cm)
Stock #:
19149

Description:

Longest Suspension Bridge, anchorage to anchorage, in the World - connecting Michigan's two peninsulas - opened to traffic Nov. 1, 1957. Facts: Total Length of Superstructure - 19,205 ft. Total Length of Suspension Bridge - 8,614 ft. Length of Main Span - 3,800 ft. Length of Bridge and Approaches - 26,444 ft. Height of Towers above Water - 552 ft. Depth of Tower Piers Below Water - 206 ft. Clearance for Ships at Center - 148 ft. Width of Roadway - 48 ft. Main Cables - 2; Diameter - 24 1/2 in. Estimated Weight of Superstructure - 76,300 tons Cost - $96,400,033.33 Designer: Dr. D. B. Steinman Father Of The Bridge: Former Sen, P. M. Brown

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