The survey was conducted using Teledyne Optech CZMIL SuperNova lidar system, which allowed Dewberry to successfully survey a 55-mile (88.5km) stretch of the Potomac River, spanning from Hancock, ...

The Potomac’s health worsened for the first time in a decade, according to Conservancy’s latest report card analyzing 2020 conditions, when the river got a grade of B-, declining from a B in 2018.

Map: See the plane and ... of the American Airlines plane on the Potomac River after the plane crashed last night on approach to Reagan National Airport on Thursday in Arlington, Virginia. The ...