Washington opened on February 25, 1951, as part of the Milwaukee-Dearborn subway, the second of two subways to be constructed in Chicago. The station was entirely renovated from 1982 to 1984. As constructed, the station has two enclosed stairways to a lower level pedestrian transfer tunnel to the closed
Washington station in the
State Street subway. At
midnight on October 23, 2006, the lower level transfer tunnel to the Red Line closed as part of the construction of a planned superstation under the
Block 37 mall. On November 20, 2009, the
pedway linking the
Lake station's unpaid area to that of Washington reopened and beginning in May 2013, the CTA provided a farecard transfer through the pedway between the stations. This is the northernmost of the three stations on one long continuous platform underneath Dearborn Street, with the stops at Monroe and Jackson being the other two. ==Service==