A century-old drawbridge on Chicago's Southeast Side is getting a major overhaul, as the city moves to rehabilitate the 100th Street Bascule Bridge over the Calumet River, a workhorse crossing that carries daily commuters, CTA buses, and heavy industrial freight through one of the city's most economically battered corridors.
The 100th Street bridge connects the East Side and South Deering neighborhoods, both in Ward 10, the historic heart of Chicago's steel industry. The surrounding communities are predominantly Latino and working-class, with median incomes well below the city average, and residents and community groups have long argued the area has received far less capital investment than the North Side or downtown. The bridge sits just a mile south of the 95th Street Bridge, which underwent a similar rehabilitation in the mid-2010s.
The bridge is a double-leaf trunnion bascule design, a style Chicago pioneered at the turn of the 20th century, and it must do two jobs at once: carry vehicle traffic on a key east-west arterial and swing open on demand for barge and Great Lakes freight moving along the Calumet River, which remains a federally protected navigable waterway. That combination of road and river obligations makes the structure unusually expensive and complex to rehabilitate, and means the city cannot simply close or reroute the crossing without Coast Guard sign-off.
The project is part of a broader wave of bascule bridge work CDOT has undertaken in recent years, funded in large part by the 2021 Bipartisan Infrastructure Law, which is sending Illinois roughly $1.4 billion over five years specifically for bridge repair and replacement. Chicago has been working through a substantial backlog of movable bridges at or past their 75-to-100-year design life, with recent projects on the Damen, Division and Cortland bridges.
For the Southeast Side, a rehabilitation of this scale carries stakes beyond traffic. Truck access to Calumet-area industrial sites, emergency response times, and bus service through the neighborhood all run through 100th Street. Community groups including the Southeast Environmental Task Force have pushed for years to bring infrastructure investment to an area that lost tens of thousands of jobs when U.S. Steel's South Works closed in 1992.
The city has posted solicitation details on its vendor portal for the engineering work. The rehabilitation is expected to require extended work periods that could mean single-lane operation or intermittent closures, though the full timeline and scope will take shape as the contractor is selected and design work proceeds. The project is one of several recent equity-focused capital investments on the South and Southwest sides, alongside efforts like the 79th Street rebuild in Auburn Gresham and a new tunnel to relieve flooding on the Southwest Side.
