South Lake Union
Sound Transit is studying the following station alternatives in South Lake Union.
- Tunnel Harrison Street Station (associated with the 5th Avenue and Harrison Alternative) (Preferred alternative)
- Tunnel station under Harrison Street between Aurora Avenue North and Dexter Avenue North
- Tunnel Mercer Street Station (associated with the 6th Avenue and Republican Alternative)
- Tunnel station on the north side of Mercer Street between Taylor Avenue North and State Route 99 / Aurora Avenue North
Tunnel Harrison Street Station (associated with the 5th Avenue and Harrison Alternative) (Preferred alternative )

Pedestrian Access – Key features
- West entrance on the southwest corner of the SR 99/Aurora Avenue North and Harrison Street intersection
- East entrance on the northwest corner of the Dexter Avenue North and Harrison Street intersection
Key
Station location
Station entry area

Bike Access - Key features
- Bike lanes on Dexter Avenue North and Thomas Street
- Access to the Cheshiahud Lake Union Loop Trail via protected bike lanes on Dexter Avenue North, Roy Street and 9th Avenue North
- Bike lockers and racks adjacent to the west station entrance (access from Thomas Street)
Key
Station location
Bike storage area
Existing bike route
Planned bike route

Transit Access – Key features
- Bus routes on Harrison Street, Dexter Avenue North and 7th Avenue North (known as State Route 99 / Aurora Avenue North north of Harrison Street)
- Bus stops on Harrison Street between Dexter Avenue North and 6th Avenue North
- Bus stops on Dexter Avenue North north of Harrison Street
Key
Station location
Bus stop
Bus route
Tunnel Mercer Street Station (associated with the 6th Avenue and Republican Alternative)

Station context
Tunnel station on the north side of Mercer Street between Taylor Avenue North and State Route 99 / Aurora Avenue North
Key
Station location

Pedestrian Access – Key features
- West entrance on the northeast corner of the Taylor Avenue North and Mercer Street intersection
- East entrances at street level on northeast corner of Mercer Street and at street level of State Route 99 / Aurora Avenue North
Key
Station location
Station entry area

Bike Access - Key features
- Bike lanes on Dexter Avenue North, Roy Street, 5th Avenue North and the north side of Mercer Street (between 5th Avenue North and Dexter Avenue North)
- Access to the Cheshiahud Lake Union Loop Trail via protected bike lanes on Dexter Avenue North, Roy Street and 9th Avenue North
- Bike lockers and racks adjacent to the station entrances (access from Roy Street or Mercer Street)
Key
Station location
Bike storage area
Existing bike route
Planned bike route

Transit Access – Key features
- Bus routes on 5th Avenue North, Dexter Avenue North and State Route 99 / Aurora Avenue North
- Bus stops on 5th Avenue North south of Mercer Street
- Bus stops on Dexter Avenue North north of Mercer Street
Key
Station location
Bus stop
Bus route