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| John Weeks |
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| benesch "The optimum design alternative featured a three-span (517 feet – 821 feet – 517 feet) continuous truss, with the center span designed as a tied arch. The river piers, now supported on open dredged caissons, rest on dense sand over 80 feet below the river bottom." A special computer program was developed to account for earthquake generated forces. Bridges Now and Then posted "I-57 Bridge over Mississippi River near Cairo, IL., 1978." (Industrial History) |
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| Katherine Hutto posted Kate Primeaux: Where’d the water go. [Some of the watershed has had a drought during the Summer of 2021.] |
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| Katherine Hutto commented on her post Second pic....different angle |
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| "Construction of main span" submitted by Mark Frazier on BridgeHunter |
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