Willy from Arlington VA on 4/29/2017 6:51:02 PM:
If you can stand traffic, you can cross at Whites Ferry on the ferry (I think its 1 dollar for bicycles). Take congested route 15 into Leesburg for about 3 or 4 miles and take the WOD trail from Leesburg to DC.
The WOD is paved the entire 47 mile length.
It also has more amenities along its length than the C and O. + cell coverage
At the end of WOD take the short jog to the Four mile run trail for 2.2 miles, then go on the Mount Vernon Trail up to the 14th st bridge. Cross into DC and you are at the Jefferson monument.