Yeah that is certainly a hardcore section of river - a virtual friend (I had been following his posts in rec.boats.paddle for years) lost his life there in a tragic accident in '98.
There are some great pictures of the river, and a vivid description of how Scott Bristow died what he loved doing - how many of us die driving to work, walking across a crosswalk, or from a heart attack at the desk? Something to think about....
Here's the link:
http://potomac.pair.com/scott.htm