Rationing imposed by World War II delayed completion of the subway due to a shortage of materials.

On February 9, 1992, the Chicago Transit Authority closed the Grand/Milwaukee station due to budget cuts and low ridership.

The station reopened on June 25, 1999 at 6:00 a.m. On April 13, 1992, the Milwaukee–Dearborn subway closed due to the great flood of Chicago.

[3] The three neighbouring stations in the Loop area, Washington, Monroe, and Jackson — form one long continuous platform that runs underneath Dearborn Street.

The Blue Line runs 24 hours a day/7 days a week, providing service between O'Hare and Forest Park.