The Potomac River doesn't have a reputation of a huge avenue of commerce and yet not too, too long ago Alexandria, Virginia, was a major port for both the citizens of Northern Virginia and Washington, DC. The Wilson Bridge which connects Virginia and Maryland just south of DC is a drawbridge but I'm not sure that it gets very heavy use. The Navy Yard is not as busy as it once was and neither is the "port" of Alexandria. But the river is still a cool thing and in some places, one might say...majestic! Doesn't the log under the dock remind you of the Loch Ness monster? Smile.