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During the 1850s and 1860s, engineers carried out a piecemeal raising of the grade of central Chicago to lift the city out of its low-lying swampy ground. Buildings and sidewalks were raised on jackscrews. The work was funded by both private property owners and public funds.
During the 1850s and 1860s, engineers carried out a piecemeal raising of the grade of central Chicago to lift the city out of its low-lying swampy ground. Buildings and sidewalks were raised on jackscrews. The work was funded by both private property owners and public funds.
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