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In page Chicago flood:

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Today, there remains contention as to whether the mistake was the fault of the workers on-site, their parent company, or even the claim that maps provided by the City of Chicago failed to accurately depict the old tunnel systems. In fact, the Kinzie Street river crossing was clearly delineated on the city maps: the typical tunnel ran down the center of the old streets. At Kinzie Street, like some of the other river crossings, it veered off to the side as the historic Kinzie bridge (at the time of the tunnel construction) was a pivoting bridge with a central pivot in the middle of the street. Thus the original tunnels were moved to the side, as were several other bridges across the Chicago River—shown in detail on the city maps.[citation needed]