The station is located under Cardinal Cushing Memorial Park, a triangular public plaza at the northeast corner of Bowdoin Square – the intersection of Cambridge Street with Bowdoin Street and New Chardon Street, located at the junction of Beacon Hill neighborhood and the Government Center area.
The single entrance to the station is near the east end of the park, with a small sunken plaza 4 feet (1.2 m) below the rest of the park and a concrete triangular prism headhouse.

Bowdoin station has a single wedge-shaped island platform (two side platforms that intersection at their east ends) about 20 feet (6.1 m) below the surface.
The platform is located inside a balloon loop which allows westbound trains to turn eastbound.
West of the loop, about 600 feet (180 m) of two tail tracks (Bowdoin Yard) run west under Cambridge Street.
The yard is used as weather-protected train storage during the winter.
The eastbound section of the platform is only long enough for four cars.
Since the Blue Line uses six-car trains, doors cannot be automatically opened; passengers must use pushbuttons on the outside of the train to open doors.

The fare lobby, slightly higher in elevation than the platform, is located in the center of the station.
A ramp leads from the fare lobby to the east end of the platform, with stairs connecting the west end of the westbound side of the platform to the lobby.
Stairs and an up escalator lead from the lobby to the surface.
The station floor is terrazzo, and the walls brown enameled brick.
The walls of the track area plus the ceilings are the painted concrete of the tunnel structure.
Trim and fittings are primarily stainless steel; columns on the platform are covered with white enamel tile and trimmed with stainless steel.
The station is located under Cardinal Cushing Memorial Park, a triangular public plaza at the northeast corner of Bowdoin Square – the intersection of Cambridge Street with Bowdoin Street and New Chardon Street, located at the junction of Beacon Hill neighborhood and the Government Center area. The single entrance to the station is near the east end of the park, with a small sunken plaza 4 feet (1.2 m) below the rest of the park and a concrete triangular prism headhouse.
Bowdoin station has a single wedge-shaped island platform (two side platforms that intersection at their east ends) about 20 feet (6.1 m) below the surface. The platform is located inside a balloon loop which allows westbound trains to turn eastbound. West of the loop, about 600 feet (180 m) of two tail tracks (Bowdoin Yard) run west under Cambridge Street. The yard is used as weather-protected train storage during the winter. The eastbound section of the platform is only long enough for four cars. Since the Blue Line uses six-car trains, doors cannot be automatically opened; passengers must use pushbuttons on the outside of the train to open doors.
The fare lobby, slightly higher in elevation than the platform, is located in the center of the station. A ramp leads from the fare lobby to the east end of the platform, with stairs connecting the west end of the westbound side of the platform to the lobby. Stairs and an up escalator lead from the lobby to the surface. The station floor is terrazzo, and the walls brown enameled brick. The walls of the track area plus the ceilings are the painted concrete of the tunnel structure. Trim and fittings are primarily stainless steel; columns on the platform are covered with white enamel tile and trimmed with stainless steel.
Bowdoin station