Water and engineering
The river reversed and the engineered city
Chicago grew on a flat, marshy site where a sluggish river met a great lake, and much of its early history is a story of engineering the ground and the water. The city literally raised its streets out of the mud, then reversed the flow of the Chicago River to protect its drinking water — one of the boldest public-works feats of its era, and the reason the river runs the way it does today.
Raising the city out of the mud
Chicago sits on low, wet ground barely above the level of Lake Michigan, and in the 1850s its unpaved streets were notorious for mud and poor drainage. To install sewers and dry out the downtown, engineers made an audacious decision: raise the grade of the streets and lift the buildings to meet it.
Through the 1850s and 1860s crews jacked up entire blocks of masonry buildings — sometimes with the businesses still open inside — while new sewers and fill went in beneath them. It was an early sign of a city willing to re-engineer its own foundations.
Reversing the Chicago River
The city's drinking water comes from Lake Michigan, but its sewage and its stockyard and industrial waste flowed into the same river that emptied into the lake — a recipe for waterborne disease. The solution, completed in 1900, was to reverse the river's flow away from the lake.
By digging the Chicago Sanitary and Ship Canal, engineers permanently sent the river's water inland toward the Illinois River and the Mississippi basin instead of out into the lake. The reversal of the Chicago River protected the water supply and remains a landmark of civil engineering; it is why the main branch appears to flow backward, away from the lake, as you watch it downtown.
Planning the lakefront city
The same engineering confidence shaped the ground plan of the city. Daniel Burnham and Edward Bennett's 1909 Plan of Chicago envisioned a system of parks, boulevards, and an open, public lakefront, and its influence is why so much of the shoreline is parkland rather than private development today.
For a visitor, the payoff is the continuous lakefront — beaches, the Museum Campus, Grant and Millennium Parks, and the Lakefront Trail — kept "forever open, clear and free," a principle that traces straight back to this era of planning and public works.
Sources
Reviewed source trail
- Encyclopedia of Chicago — Chicago River — checked 2026-07-12
- Encyclopedia of Chicago — Plan of Chicago — checked 2026-07-12
- Metropolitan Water Reclamation District — history — checked 2026-07-12