Why Chicago's Secret Tunnel Got Paved Over

The LaSalle Street Tunnel in Chicago, completed in 1871, was one of the city's earliest subterranean infrastructure projects, designed to alleviate congestion and provide a crucial crossing under the Chicago River. The tunnel, constructed by the private LaSalle Street Tunnel Company, was initially intended for pedestrian and carriage use, facilitating easier movement between the north and south sides of the city. However, the tunnel faced numerous challenges, including frequent flooding and structural issues exacerbated by the city's growing industrial demands. By the early 20th century, with the advent of more advanced transportation options, the tunnel became obsolete and was eventually closed in 1939. Its legacy remains a fascinating glimpse into the early engineering feats that shaped Chicago's urban landscape.