Construction to Begin on Mount Vernon Avenue Bridge, Expect Delays

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Dave Levy

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Jul 30, 2025, 1:41:34 PMJul 30

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Construction to Begin on Mount Vernon Avenue Bridge, Expect Delays

Starting mid-August, Arlington County will begin reconstruction of the Mount Vernon Avenue Bridge over Four Mile Run which is in poor condition and has already had the sidewalk on the west side closed due to structural deficiencies. . The bridge reconstruction and related work is expected to last two years. Construction signage and detour routes for area trails have already been posted. The $23.8M project is a joint capital improvement project between the City of Alexandria and Arlington County with a 50/50 project cost share between both parties.

During the project, Arlington County will upgrade the roadway and bridge deck of the structure one side at a time, keeping the other side of the bridge open for traffic in both directions. There will be one sidewalk on the bridge open at all times.

A map of the Mt Vernon Ave bridge over Four Mile Run, with an inset showing lane closures for pre-construction work around the bridge median.

The pre-construction period is expected to last two months. During this period, bridge traffic will be reduced to the outer lanes for work on the median.

Beginning next week, minor preparations for the reconstruction will take place on the Alexandria side of Four Mile Run. For the duration of the project, the City of Alexandria will ensure there are proper erosion and sediment controls in the park and along Four Mile Run, including tree fencing.

A map of the Mt Vernon Ave bridge over Four Mile Run, showing Phase 1 southbound lane closures in red, the trail detour on the Arlington County side, and the northbound traffic pattern.

Phase 1 of the project is expected to last for one year. During this period, bridge traffic will be reduced to a single lane in each direction while both southbound lanes are under construction.

There are no closures for pedestrians or cyclists on the Alexandria side of Four Mile Run at this time. Weekend parking along Mount Vernon Avenue will be unavailable for the duration of the project.