The Line of Duty

Historical marker location:

1100 Ohio Drive Southwest, East Potomac Park, District of Columbia

( Marker is on Ohio Drive Southwest north of Buckeye Drive Southwest, on the right when traveling north.)

United States Park Police. National Park Service, U.S. Department of the Interior

The city was built on a swamp: The area that is now Washington, D.C. was originally a swampy, marshy region along the Potomac River. The construction of the city involved extensive drainage and landfill projects to make the land suitable for building.