This $615 million project is key to cleaning up the Potomac River ... drill will go under the river itself. The mining must be complete by the start of next year. The Washington Post went 100 ...

The wreckage of a U.S. Army Black Hawk helicopter in the Potomac River in Washington, D.C., Thursday. (BRANDON GILES/U.S. COAST GUARD) The U.S. Coast Guard released images taken Thursday of the ...

An American Airlines Flight 5342 collided with a U.S. Army Black Hawk helicopter and crashed into the Potomac River on ...