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.

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, ...

An estimated 300 to 350 homes along the Potomac River in Washington County were “wholly or partially flooded.” Edison power plant in Williamsport, Maryland, after the March 18, 1936 flood ...