The Fredericksburg Free Lance-Star has an article on the sediments
behind the recently breached concrete Embrey Dam on the Rappahannock
River above Fredericksburg and the wooden dam above it. Both are
scheduled for removal of the remainders. The article stated that while
a lot of silt remains and is causing concerns, that about 240,000 cubic
yards of material was dredged from the area prior to dam demolition.
Estimates are of 50k cubic yards of sediment remaining.

The article is at:
http://fredericksburg.com/News/FLS/2004/082004/08122004/1460671

I hadn't read in Tim Tompson's earlier posts that dredging was to be
used. Provisions were in place for monitoring. How was this to be
accomplished with a dredger?  Assuming a typical snorkle dredge was
used, the resultant wood would indeed be somewhat finely chopped.

Lyle Browning