Update at 4:35 p.m. — The flooding has cleared up and all lanes have reopened, according to Dr. Gridlock.
Route 1 is closed just south of Potomac Yard in Alexandria due to flooding in the roadway.
High water and mud spilled onto the roadway from an adjacent construction site, a tipster tells us. Earlier rains have since stopped, but so far no word as to how much longer Route 1 will remain shut down.
Traffic is reportedly being rerouted onto Potomac Avenue, which runs behind Potomac Yard and into Crystal City.
Photo courtesy David Hyde