Interchange of Boundary Channel Drive, Interstate 395 and Long Bridge Drive (area outlined in red below)
October 2019 update: The project is currently in the process of being transferred to the Virginia Department of Transportation (VDOT) to administer the design and construction phases. The project's environmental review process concluded in October 2019 with the Federal Highway Administration’s (FHWA) approval of the Interchange Modification Report and issuance of a Categorical Exclusion.
The project goal is to upgrade the Boundary Channel Drive/I-395 interchange to improve traffic operations and safety for all users. The existing interchange is inadequate for current demands and for future planned growth in Crystal City. The interchange project also includes a connection to Long Bridge Park Drive and a bicycle connection from the Humpback Bridge to Long Bridge Park.
Based on the feedback received at our June 2015 public meeting, and feedback received from VDOT and Pentagon staff, Arlington County leadership and FHWA staff selected the accepted concept which was analyzed in the approved Interchange Modification Report. The accepted concept provides the best balance of traffic operations and safety for all modes, while minimizing impacts to the Pentagon and future improvements to Long Bridge Drive and the future expansion of Long Bridge Park. The accepted design concept includes converting the existing full cloverleaf interchange design to a partial cloverleaf configuration for the southbound I-395 ramps; the existing ramps in the southwest quadrant will be removed and all movements to / from southbound I-395 will be consolidated on the existing ramps in the northwest quadrant. In doing so, the two existing weaving segments along southbound I-395 in the vicinity of Boundary Channel Drive will be eliminated.
Boundary Channel Drive will be reduced from four lanes to two lanes and all existing ramp terminals along Boundary Channel Drive will be converted to roundabouts. The eastern side of the interchange will be reconfigured to better separate various movements and provide an improved connection between Long Bridge Drive and I-395 northbound. The proposed improvements also include enhanced pedestrian and bicycle connections from the Mount Vernon Trail on the west side of the interchange to Long Bridge Drive and Long Bridge Park on the east side of the interchange by providing shared use paths along both sides of Boundary Channel Drive through the interchange area.
This is a regionally significant project that is being coordinated with our partners at FHWA, Department of Defense, National Park Service, Northern Virginia Transportation Authority, VDOT and the District Department of Transportation.
A public information meeting was held in December 2019. County staff and partnering agencies shared and sought feedback on the accepted concept.
December 2019 Presentation Boards
Background (Existing bike network, crash history, and Aquatic Center rendering site plan)
The accepted concept is mostly a hybrid of Concepts 1 and 2. For both the eastern roundabout and the intersection of Long Bridge Drive, the I-395 NB on-ramp, and Long Bridge Park Aquatic Center, the accepted concept follows Concept 1. At the western roundabout, the accepted concept incorporates the design from Concept 2. Lastly, at the intersection of Boundary Channel Drive and the Pentagon Access Road, the accepted concept incorporates an unsignalized version of the intersection illustrated in Concept 3.
Subsequent project status updates were presented to the Arlington County Bicycle Advisory Committee and Crystal City BID on Jan. 7, 2019, and Sept. 12, 2019, respectively.
The project is fully funded via a combination of local and state revenue sharing sources, regional funds from the Northern Virginia Transportation Authority, and local bonds.