Washington is the northern station of the continuous island platform under downtown Chicago on the Dearborn Street Subway that opened on February 25, 1951. The station is unreovated since it opened, with the platform having dimy lit forescent lights in the cieling of the arched platform roof. The station also has sealed staircases that once led down to a free transfer tunnel to the Red Line and the State Street subway at the now closed Washington Red Line Station
The station, like the others on the Downtown Chicago Subways has two mezzanines. southern Washington/Madison mezzanine is accessible by a combined staircase/escalator, with a secondary staircase beyond the stopping area for trains, that leads up to a high exit turnstile. This mezzanine contains an exit staircase up to each corner of Calhoun Place and Dearborn Street (between Washington and Madison Streets).
The northern Washington and Randolph Mezzanine contains access direct access to the Chicago pedway system and an underground connection through the Block 37 Shopping Mall to the southern mezzanine of the Red Line's State Station. This mezzanine also has entrances from each side of Dearborn Street
Photos 1-7 on 17 July, 2009, 8-20 on 3 August, 2012; 21-27: 10 June, 2018; 28-29: 13 January, 2019; 30-32: 16 February, 2019