James River crossings
I added in the two "missing" bridge articles in the Richmond area, which should allow your navbox to get west through the VA-288 bridge. Beginning with the new article for the Vietnam Veterans Memorial Bridge, the others, in order east to west are: 

I-95 bridge at Richmond, part of the former Richmond-Petersburg Turnpike)
Mayo Bridge (U.S. Route 360)
Manchester Bridge (U.S. Route 60)
Robert E. Lee Memorial Bridge (U.S. Route 1/U.S. Route 301)
Boulevard Bridge (State Route 161) (toll and major weight restrictrions)
Powhite Parkway Bridge (State Route 76) (toll)
Huguenot Memorial Bridge (State Route 147)
Edward E. Willey Bridge (State Route 150)
World War II Veterans Memorial Bridge (State Route 288)
  
I cannot help much west of that point. Nice work on the navbox.