An aerial view of the north façade of the Freer Gallery of Art, which is surrounded by trees, taken from above the National Mall. The U.S. Department of Agriculture building is to the right at 12th ...

The aircraft used by NOAA to conduct LiDAR scanning of the Potomac River early Friday. Photograph courtesy of Unified Command. LiDAR—which stands for “light detection and ranging”— uses laser light ...

Investigators scan bottom of river Saturday To help divers identify additional items for removal from the Potomac, NOAA was set to fly a low-altitude TopoBathy lidar flight overnight, officials ...

Potomac River 'fully restored' after mid-air collision, U.S. Army Corps of Engineers says Crews have finished recovering the wreckage of a plane and helicopter that collided mid-air, killing 67 ...

DC's $819M Potomac River Tunnel breaks ground with dual TBMs DC Water breaks ground on a 5.5-mile tunnel under D.C. to capture sewage overflows, aiming to cut Potomac River pollution by 93% by 2030.

This is an aerial view of the Freer Gallery of Art, looking south. Trees surround the Freer. Twelfth Street runs along the building to the right. The Department of Agriculture building is to the right ...