Thanks for the information.
My ride through DC yesterday was very nice, folklife festival was fun. Parked near the Anacostia River trail system, rode to the mall and around DC, then headed over to the mall. The area near the fish market is under construction and a PIA. 4th and Pennsyvania is the better option.
So I guess you are riding down during the 4th wknd!! Hope all goes well. I love to bike over the bridges on the Potomac and Anacostia rivers. You can do this to get to Va. If you ride into Va you can head down the Mt Vernon trail and cross the Potomac on the 495 Beltway, quite a view. Unfortunately this area is not connected to the Anacostia river trails. It is in the plans though. It will make a great loop. Custis, W&OD trail and Mt Vernon trails are nice rides in NoVa. Have fun and thanks again.