3rd Street Tunnel | Overview
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The 3rd St Tunnel Project is the first of a multi-phase master planned development located in Washington’s central business district. Newly designed pedestrian and vehicular corridors will reconnect the Capitol Hill and East End communities, update traffic patterns, and deliver new safety features. The project is bordered by Massachusetts Avenue to the North, E Street to the South, Third Street to the West and Second Street to the East.

The infrastructure portion will include three areas of improvement: utility upgrades along Massachusetts Avenue; new entry and exit portals to I-395 to ease traffic congestion and deliver new safety features for pedestrians and cyclists; and a continuous deck that will be constructed above the existing I-395 Center Leg Freeway, from Mass Ave to E Street between 2nd and 3rd Streets. This platform will reconnect the District’s street grid at F and G Streets, NW as originally designed in the L’Enfant’s master plan of the City. It will also support the Capitol Crossings development, which will be a 2.2 million Square-foot mixed-use project.

The District of Columbia has long encouraged the development of a platform over I-395.  Following an extensive environmental assessment, outreach to the affected communities and approval of the necessary permits, construction commenced at the end of March 2014. DDOT and many other agencies have worked closely with the developer and contractor to create a viable maintenance of traffic plan for the project during all phases of construction.





Phase IV

Similar traffic pattern to phase III of construction. No additional lane closures.
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A new traffic pattern will reopen traffic to a new H Street alignment. Vehicles traveling westbound
on H Street will be able to either continue westbound onto Mass Av or continue southbound
onto 3rd Street. For the duration of Phase III, H St…
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During Phase II, crews will advance their work at the intersection of 3rd and H Street, which will be closed temporarily
during this phase, and both vehicular and pedestrian traffic will be detoured around the area. Traffic traveling
south bound on 3rd street will…
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A new temporary traffic pattern will be put in place to allow crews to remove, relocate, and replace existing underground
utilities along Mass Ave and H St, NW, between 3rd and 4th Streets. For the duration of Phase I, H St east and westbound…
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Pre-Phase – COMPLETE

In preparation for Phase I construction activities will include the removal of existing curbs and concrete islands;
installation of temporary pedestrian walkways and ramps and installation of temporary streetlights and poles along
Massachusetts and H Streets, between 2nd and 4th Streets NW. Utility verification
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