Updated: Route 1 Completely Reopens

4:43 p.m. update — According to an email from Patch reader Julie Valentine, all four lanes have reopened on Route 1. 

"No water on the roadway," she wrote. "Traffic moving at speed."

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3:27 p.m. — According to the Twitter feed of the City of Alexandria, one lane of Route 1 has been reopened in both directions. All lanes should be reopened by approximately 4:30 p.m.

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3 p.m. update — City of Alexandria engineer Emily Baker said Wednesday’s flooding on Route 1 is related to “ongoing storm sewer construction” at Potomac Yard. She said it’s not a “development construction issue.”

A necessary pump was not on site Wednesday to deal with the heavy morning rain.

"We're still looking at all the details," she said. 

Crews are aiming to get Route 1 reopened by afternoon rush hour.

“That’s the target,” she said. “We’re coordinating very closely with the contractor on site and the developer.”

The flooding is contained to the roadway. 

Route 1 traffic is being diverted to Potomac Avenue on the east side of Potomac Yard.

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Route 1 is closed in both the northbound and southbound directions, between E. Custis Avenue and Swann Avenue, due to flooding.

Route 1 will remain closed until floodwaters are pumped out and the roadway is safe for travel.

The Alexandria Police Department is directing traffic at the scene.

The flooding is just south of and the other shops on Route 1 in Potomac Yard.

Commuters are urged to avoid the area until further notice, and use the George Washington Parkway or other alternate routes.