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[quote user="CSSHEGEWISCH"]Masted vessels no longer use the Sanitary & Ship Canal west of Ashland Ave. and there is enough vertical clearance for tug/barge combos when the bridges are in the lowered position.  I'm not sure about the five movable vehicular bridges on the Calumet River but none of the movable vehicular bridges on the Chicago River and its branches are manned full-time.  When the bridges need to be raised, at scheduled times for pleasure boats or as requested for the now-rare commercial freighter, three crews are assigned to operate the bridges and leap-frog up or down the river with the vessels.[/quote] Ahhh,  I see now. thank you very much
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