I took this picture from near the D.C. side of the (Francis Scott) Key Bridge last Friday.
The water passing under the bridge is, of course, the Potomac River. The left side is the east bank of the river with the top half of the Washington Monument visible in the distance. The land mass in the center is the Roosevelt Island followed by the west bank of the river.
Here is a picture of the area from Google Earth. The Key Bridge is near the top left-hand corner; the asterisk is marking the approximate spot where I took the picture from, while the numbers 1 and 2 are the Roosevelt Island and the Washington Monument, respectively.